| 单词 | perihelion |
| 例句 | The exact distances of Earth’s perihelion and aphelion change a bit from year to year because of the gravitational influence of the other planets, as well as that of the moon. Earth’s Aphelion Isn’t the Reason for the Seasons 2023-06-30T04:00:00Z Even as the Northern Hemisphere experiences winter’s chill, our planet on Wednesday will be at perihelion, the closest it gets to the sun during its elliptical orbit. Jan. 4: Earth will be at its closest point to the sun 2023-01-01T05:00:00Z Mercury has a highly elliptical orbit, so that it is only about two-thirds as far from the Sun at perihelion as it is at aphelion. Astronomy 2016-10-13T00:00:00Z On Jan. 4, our home blue planet reaches perihelion — Earth’s closest point to the sun — on our annual orbiting tour around the sun, according to the observatory. Sky Watch: Venus and the Quadrantid meteors are among January’s highlights 2022-01-01T05:00:00Z The Naval Observatory reminds the world that in our annual journey around the sun, Earth reaches perihelion — our closest point to the sun all year — on Jan. 2 at 8:51 a.m. Skywatch: What’s happening in the heavens in January 2020-12-26T05:00:00Z The most surprising thing about this cycle, though, is probably when its extremes occur on the calendar: perihelion is in January every year, while aphelion is in July. Earth’s Aphelion Isn’t the Reason for the Seasons 2023-06-30T04:00:00Z As philosopher of science Thomas Kuhn noted, Newton's laws were retained despite the fact that they were contradicted for decades by the motions of the perihelion of Mercury and the perigee of the moon. The Idea that a Scientific Theory can be 'Falsified' Is a Myth 2020-09-07T04:00:00Z General relativity, however, predicts that due to the curvature of spacetime around the Sun, the perihelion of Mercury should advance slightly more than is predicted by Newtonian gravity. Astronomy 2016-10-13T00:00:00Z For the Northern Hemisphere, Comet Leonard is tricky, as that dirty, fuzzy snowball reaches perihelion on Jan. 3. Sky Watch: Venus and the Quadrantid meteors are among January’s highlights 2022-01-01T05:00:00Z The close pass, known as a perihelion, puts the probe between the orbits of Venus and Mercury. Europe's Sun mission makes first close pass 2020-06-14T04:00:00Z Its closest approach to the Sun, called perihelion, will occur on May 27. Amateur astronomer used NASA satellite data to discover new comet 2020-05-13T04:00:00Z The star’s closest point to the black hole, known as perihelion, advances around in a circle by about a fifth of a degree — 12 arc minutes. Dancing With a Black Hole 2020-04-16T04:00:00Z As the comet approached perihelion in September 2015, the spacecraft backed off to ensure its safety. Astronomy 2016-10-13T00:00:00Z That comet was naked-eye brightness and it was visible in broad daylight after it passed perihelion — its closest passage to the sun, Chester said. Skywatch: What’s happening in the heavens in April 2020-03-28T04:00:00Z It reached its closest point, known as perihelion, on Dec. 8, 2019, when it got within 190 million miles of the sun. Black holes, interstellar objects, Mars discoveries and moon landing attempts: Top space stories of 2019 2019-12-18T05:00:00Z “It gets very granular,” he says, but explains it anyway: every planet wobbles on its axis like a spinning top, a phenomenon called the precession of perihelion. A Geological "Orrery" Could Reveal Planetary Dynamics in Deep Time 2019-04-09T04:00:00Z It will reach its first perihelion, or point closest to the Sun, at about 10:28 p.m. NASA’s Parker Solar Probe breaks record, becomes closest spacecraft to the Sun 2018-10-29T04:00:00Z Once a comet is diverted into the inner solar system, it typically survives no more than a few thousand perihelion passages before losing all its volatiles. Astronomy 2016-10-13T00:00:00Z The comet’s closest approach to Earth is calculated for May 23 at a distance of about 72 million miles; and the comet reaches perihelion May 30 at around 8 p.m. Skywatch: What’s happening in the heavens in April 2020-03-28T04:00:00Z But going back to the orbit: The Goblin’s is similar in key ways to those of some other extremely distant bodies—particularly in an element called “longitude of perihelion.” Newfound World "The Goblin" May Lead to Mysterious Planet Nine 2018-10-02T04:00:00Z In the arcane parlance of astronomy, they clustered around a common “argument of perihelion.” Looking for Planet Nine, Astronomers Gaze into the Abyss 2018-03-22T04:00:00Z Earth gets closest to the sun — an event called perihelion — on Wednesday at 12:35 a.m. Sky Watch: January is packed with action 2017-12-30T05:00:00Z Suppose a comet were discovered approaching the Sun, one whose orbit would cause it to collide with Earth 20 months later, after perihelion passage. Astronomy 2016-10-13T00:00:00Z Scientists hope that as Ceres approaches its April 2018 perihelion — its closest pass of the sun — the increase in light and heat will trigger a burst of volcanic activity. Dwarf planet Ceres may hold a towering ice volcano 2016-09-02T04:00:00Z Mercury reaches perihelion April 5, the planet’s closest run to the sun, and on April 8, find a sliver of a baby moon near the fast planet at dusk. Skywatch: April brings planetary presents 2016-04-02T04:00:00Z This made it the object with the farthest-known perihelion, just beating the dwarf planet Sedna, whose perihelion is 76 AU. On the hunt for a mystery planet 2016-03-14T04:00:00Z It starts to vent gas and dust as it heats up - about a month before perihelion, the point at which it is closest to the Sun along its orbit. Striking views of our Solar System - BBC News 2016-01-13T05:00:00Z What is the period of revolution for a comet with aphelion at 5 AU and perihelion at the orbit of Earth? Astronomy 2016-10-13T00:00:00Z In his third November paper, Einstein returned to the perihelion motion of Mercury. History: Einstein was no lone genius 2015-11-15T05:00:00Z On Thursday, the comet and the accompanying Rosetta will reach perihelion—the point on the comet’s 6.5-year orbit that takes it closest to the sun. Rosetta Spacecraft to Collect New Data as Comet Approaches Sun 2015-08-12T04:00:00Z They found that the closest it ever gets to the Sun — a measure known as its perihelion — is 80 AU, beyond the bulk of the Kuiper belt. On the hunt for a mystery planet 2016-03-14T04:00:00Z On Thursday, when the comet reaches perihelion, its closest point to the Sun, that activity will reach its peak. Scientists to get ringside view as comet 67P reaches closest point to Sun 2015-08-08T04:00:00Z The relativistic advance of perihelion was later also observed in the orbits of several asteroids that come close to the Sun. Astronomy 2016-10-13T00:00:00Z “Congratulations on conquering the perihelion motion,” Hilbert wrote to him on 19 November. History: Einstein was no lone genius 2015-11-15T05:00:00Z In 1989, Pluto reached perihelion—the closest point to the sun in its elliptical orbit. Feature: How Alan Stern’s tenacity, drive, and command got a NASA spacecraft to Pluto 2015-06-25T04:00:00Z Astronomers must observe an object multiple times over the course of a year to pin down its orbit and determine its perihelion. On the hunt for a mystery planet 2016-03-14T04:00:00Z Comets become quite active during their orbits as they get closer to the Sun, so sticking with 67P will allow Rosetta to see how its activity waxes and wanes around the perihelion. Rosetta To Land On Comet After Dangerous Extended Mission 2015-06-24T04:00:00Z As they approach perihelion, the comets speed up and whip through the inner parts of their orbits more rapidly. Astronomy 2016-10-13T00:00:00Z And it would be the perfect time. 67P is approaching perihelion – its closet point to our star. Comet robot Philae phones home again - BBC News 2015-06-15T04:00:00Z Earth reaches perihelion — our planet’s closest point to the sun — on Jan. 4. Skywatch: Mercury and Venus become cosmic companions in January 2014-12-27T05:00:00Z In August, the comet reaches perihelion, its closest point to the Sun, and it will become “active like hell”, says Sierks. Philae’s 64 hours of comet science yield rich data 2014-11-17T05:00:00Z The comet is due to reach its perihelion, the nearest pass to the Sun, on August 13. Rosetta To Land On Comet After Dangerous Extended Mission 2015-06-24T04:00:00Z The orientation of a typical comet tail changes as the comet passes perihelion. Astronomy 2016-10-13T00:00:00Z Comet Siding Spring reaches perihelion, its closest point to sun, on Oct. Skywatch: October is a tale of two eclipses Physics as practiced then was adept at making very precise, quantitative predictions about a variety of phenomena, from the electron’s charge to the perihelion of Mercury. Falsification and its discontents 2014-01-24T21:38:33Z This was the brightest comet of the 20th century, and was found just over a month before perihelion in the morning sky, moving rapidly toward the Sun. 'Comets of the Centuries': 500 Years of the Greatest Comets Ever Seen 2013-12-26T21:15:00.468Z Prospects for the comet’s survival are slight, as it reached perihelion — the closest approach to the sun — on Thursday. Venus, Jupiter will beam brightly this month 2013-12-02T05:01:00Z Generally, astronomers expect the comet to reach naked-eye visibility just days before perihelion. Skywatch: Want to see a partial solar eclipse? Better get up before sunrise Nov. 3. 2013-10-26T21:14:23Z It reaches perihelion — the closest approach to the sun — March 10. Look for Comet Panstarrs in March — but look hard 2013-03-03T01:58:03Z Relativity was created when discrepancies like the error in the perihelion of mercury revealed gaps in Newtonian physics. Is the age of scientific genius over? 2013-02-04T12:45:02.187Z In the early 1600s, Kepler discovered that planets move faster at the part of their orbit that is closest to the sun, the perihelion. Elliptical Answers to Why Winter Mornings Are So Long 2013-01-14T23:11:26Z I dove closer to the sun than even she did at perihelion, and flew as far away as the Oort cloud at aphelion. Celestial bodies 2012-06-27T17:51:08.497Z They find that the date of perihelion passage was March 25, 1066, which differs by only 4 days from the date found by Hind. Astronomical Curiosities Facts and Fallacies 2012-03-27T02:00:18Z That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z Applying the new theory to the case of the motion of Mercury's perihelion, it is found to account for the excess quite exactly. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z After the solstice, Earth continued its acceleration until reaching perihelion on Jan. 2. Elliptical Answers to Why Winter Mornings Are So Long 2013-01-14T23:11:26Z The Mars opposition of 2003, on the other hand, occurred when the Red Planet was near perihelion, or its closest distance to the sun. Best Mars Sky Show of 2012 Occurs Saturday: How to Watch Online 2012-03-03T02:45:19.460Z The distance of this remarkable comet from the sun at its perihelion passage was less than that of any known comet. Astronomical Curiosities Facts and Fallacies 2012-03-27T02:00:18Z Pertaining to the anomaly, or angular distance of a planet from its perihelion. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z If Newton's theory is absolutely true, the excess motion of Mercury's perihelion remains a mystery. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z From the immense rapidity of its motion as it approaches its perihelion, it is probable that it is a comet of very long period. Antigua and the Antiguans, Volume II (of 2) A full account of the colony and its inhabitants from the time of the Caribs to the present day 2012-02-09T03:00:13.500Z Newcomb found an excess of motions in the perihelion of Mars amounting to about 5″ per century. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 4 "Grasshopper" to "Greek Language" 2011-11-28T03:00:19.517Z The perihelion portion of its orbit lies between the orbits of Mars and the earth, and the aphelion part is outside the orbit of Mars. Astronomical Curiosities Facts and Fallacies 2012-03-27T02:00:18Z It appears that variations in the position of the earth at perihelion have a real though slight influence in causing cycles with a length of about 21,000 years. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z On doing this, it soon appeared that Mars, when in perihelion, or nearest the sun, always moved swiftest, while at its greatest distance from the sun, or aphelion, its orbital velocity was slowest. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z He appears to me to be a comet without any perihelion, and capable of setting a whole system on fire. Some Jewish Witnesses For Christ 2011-10-14T02:00:24.730Z At perihelion, its closest point, Eris is only 5.8 billion kilometers from the sun. Pluto Might Be the Largest Dwarf Planet, After All 2011-10-12T23:45:00.250Z Anom′alous, irregular: deviating from rule.—Anomalistic year, the interval that elapses between two successive passages of the earth through its perihelion, or point of nearest approach to the sun = 365 days 6 hr. Chambers's Twentieth Century Dictionary (part 1 of 4: A-D) 2011-10-11T02:01:08.990Z In the course of 21,000 years the time of perihelion varies from early in January through the entire twelve months and back to January. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z The extremes of temperature at perihelia and aphelia to which comets are subjected did not bother him particularly. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z Bodies which revolve round the sun, in very long ovals, approaching him very nearly in their perihelion, but in their aphelion, passing to a distance immeasurably great. Conversations on Natural Philosophy, in which the Elements of that Science are Familiarly Explained 2011-07-12T02:00:28.027Z A man whom the perihelion of a great man does not set on fire and beside himself is nothing worth. Hesperus or Forty-Five Dog-Post-Days Vol. I. A Biography 2011-05-11T02:00:19.453Z In the six weeks in which Mercury moves from aphelion to perihelion, it approaches the Sun by fourteen millions of miles, and the heat received by it is increased 2½ times. Are the Planets Inhabited? 2011-04-24T02:00:07.733Z Hence arises what is known as the precession of the equinoxes, that is, a steady change in the season at which the earth is in perihelion, or nearest to the sun. Climatic Changes Their Nature and Causes 2011-10-28T02:00:24.840Z Comets must lose much of their original substance every time they return to perihelion. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z EROS, a minor planet discovered by Witt at Berlin on the 14th of August 1898, and, so far as yet known, unique in that its perihelion lies far within the orbit of Mars. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 "Equation" to "Ethics" 2011-02-27T03:00:31.973Z Biela comet is a specimen of the type which astronomers call periodic comets—i. e., those which move in small ellipses and have correspondingly short periodic times, so that they return frequently and regularly to perihelion. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z These are the comets, some of which all but graze the surface of the Sun at perihelion, and then recede from him for periods that it takes even thousands of years to complete. Are the Planets Inhabited? 2011-04-24T02:00:07.733Z In astronomy, the angle which a line drawn from a planet to the sun has passed through since the planet was last at its perihelion or nearest distance to the sun. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli Then we are at last joined with the Héllenes and Latins in the descending scale, and it is the Teuton now approaching the perihelion, with the Slav, yet to conquer, in the far distance. Sonnets from the Patagonian Without some geographical change the Antarctic ice could not materially diminish during its winter in perihelion, nor increase to any important extent during the opposite phase. Island Life Or the Phenomena and Causes of Insular Faunas and Floras Frequently this is the name of their discoverer, but often a different system is followed—e. g., the name 1886, IV, means the fourth comet to pass through perihelion in the year 1886. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z At perihelion it is 31 millions of miles from the Sun; one-third the distance of the Earth. Are the Planets Inhabited? 2011-04-24T02:00:07.733Z The anomalistic year is the interval between two successive times at which the earth is in perihelion, or 365 days 6 hours 13 minutes 48 seconds. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli A comet is visible only in a small arc of its orbit near perihelion, differing but slightly 760 from the arc of a parabola. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" Observations on a comet moving in an extremely eccentric ellipse, which are possible only when it is comparatively near perihelion, must fail to distinguish its orbit from a parabola. Essays: Scientific, Political, & Speculative, Vol. I When at its perihelion it was moving with a velocity of 300 miles per second! A Text-Book of Astronomy 2011-01-05T03:00:57.347Z At perihelion it comes within the orbit of Venus; indeed, nearly halfway between that and the orbit of Mercury. Are the Planets Inhabited? 2011-04-24T02:00:07.733Z In regard to the earth and the other planets, these two points are called the aphelion and perihelion; and in regard to the moon they are called the apogee and perigee. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli The closely related orbits of the four bodies are also remarkable for approaching nearer the sun at perihelion than does the orbit of any other known body. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" At present, the aphelion occurs at the time of our northern summer; and the perihelion during the summer of the southern hemisphere. Essays: Scientific, Political, & Speculative, Vol. I At perihelion it would reach inside Mercury, round the Sun, and head outward again. Astounding Stories of Super-Science, March 1930 Was it always decreasing? and if so, how far back was it so excentric that at perihelion the earth passed quite near the sun? Pioneers of Science In recent years a few have been discovered which are at times considerably within the orbit of Mars, the nearest perihelia being less than 15 million miles beyond the earth's orbit. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli A tail also is generally not seen at great distances from the sun, but gradually develops as the comet approaches perihelion, to fade away again as the comet recedes from the sun. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" Severally subject to great heat at perihelion, these would behave more or less differently. Essays: Scientific, Political, & Speculative, Vol. I Besides those already mentioned there are many comets with orbits of such marked eccentricity that their ellipses when near perihelion cannot be distinguished from parabol�. The Astronomy of Milton's 'Paradise Lost' The solar tide varies between aphelion and perihelion from 1·9 to 2·1. Pioneers of Science At perihelion it penetrates within the orbit of Mercury; it considerably transcends at aphelion the farthest excursion of Pallas. A Popular History of Astronomy During the Nineteenth Century Fourth Edition Another fact tending towards this same conclusion is that after this comet passed perihelion it showed several nuclei following each other. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" I met not long since an officer who, at Halifax in Nova Scotia, saw the comet at noon close to the sun, and very conspicuous the day after the perihelion passage. Personal Recollections, from Early Life to Old Age, of Mary Somerville Let us, for instance, follow the progress of the comet through its perihelion passage, in which the track lies near that of the planet Mercury. The Story of the Heavens Glory of the Galaxy—bound from Earth to Mars on perihelion. A Place in the Sun Each return to perihelion took place about two and a half hours sooner than received theories warranted. A Popular History of Astronomy During the Nineteenth Century Fourth Edition Moreover, a large majority of comets would then have their aphelia in the direction of the sun’s motion, and therefore their perihelia in the opposite direction. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" The elements of the strange orb were immediately calculated, and it was at once conceded by all observers that its path, at perihelion, would bring it into very close proximity with the earth. Blackwood's Edinburgh Magazine, Volume 62, Number 385. November, 1847. If the comet be a periodic one, the same series of changes may take place at its next return to perihelion. The Story of the Heavens The imaginary line joining the aphelion and perihelion points in the orbit of a planet. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. A very uncommon circumstance in its development was that it lost all trace of tail previous to its arrival at perihelion on the 16th of November. A Popular History of Astronomy During the Nineteenth Century Fourth Edition It returned to its perihelion in 1835, and was well observed in almost every observatory. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 7 "Columbus" to "Condottiere" Then as the earth passes round its perihelion, the kinetic energy is used up in assisting the earth to overcome the attraction of the sun. Aether and Gravitation It follows that, as the comet at each perihelion passage makes a tail, it must on each occasion expend a corresponding quantity of tail-making material. The Story of the Heavens In the orbit of a planet, means the line joining its aphelion and perihelion. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. Yet it had still seventeen days' journey to make before reaching perihelion. A Popular History of Astronomy During the Nineteenth Century Fourth Edition At their perihelion, many of these bodies pass within the orbit of Mercury, while the aphelion of some lies without the path of Uranus. A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation' It passed its perihelion on December 8th, and when nearest to the sun was only about 1/10 part of the sun's diameter from the surface. Aether and Gravitation Each perihelion passage witnesses the formation of a tail, and the expenditure of a corresponding amount of the capital. The Story of the Heavens On nearing the vessel they rapidly turned, like a comet round its perihelion, placed themselves side by side, and, in parallel trails of light, kept up with the ship. Fragments of science, V. 1-2 It was devoid of tail, or any other kind of appendage; and the rapid loss of the light acquired during perihelion passage was accompanied by inordinate expansion of an already tenuous globular mass. A Popular History of Astronomy During the Nineteenth Century Fourth Edition The largest comet in the galaxy reached perihelion, and practically outshone the sun it circled. Talents, Incorporated Having passed its perihelion, in view of the physical existence of our centrifugal motion, let us now ask ourselves what ought to happen to the comet? Aether and Gravitation Each time the comet comes back to perihelion in two and a half hours less than on the former occasion. The Story of the Heavens When Halley's Comet of 1682 approached the fierce ordeal of its perihelion position, the exhalation of its tail was distinctly perceived. Chambers's Edinburgh Journal, No. 450 Volume 18, New Series, August 14, 1852 Thus multiple tails are developed when the same comet throws off, as it approaches perihelion, specifically distinct substances. A Popular History of Astronomy During the Nineteenth Century Fourth Edition Still, we have Josephine, and I am sure she will honor us; for she was born six years ago under the conjunction of Jupiter and Venus, and while Mars was at perihelion. The House An Episode in the Lives of Reuben Baker, Astronomer, and of His Wife, Alice Now this is exactly what observation teaches us does happen in regard to comets, when they have passed their perihelion passage. Aether and Gravitation This very remarkable observation was made less than a day after the perihelion passage, and illustrates the wonderful activity in the interior of a comet when very close to the sun. The Story of the Heavens It didn't get much heat from the sun except at perihelion, you know, so it's probably somewhere around minus two hundred and sixty degrees now. Spacehounds of IPC It was, in fact, then within a few hours of perihelion. A Popular History of Astronomy During the Nineteenth Century Fourth Edition When the face has all the soft beauty of a woman, and the figure, slight, slender, lithe and graceful, carries only a suggestion of the masculine strength to come—then beauty is at perihelion. Little Journeys to the Homes of the Great - Volume 14 Little Journeys to the Homes of Great Musicians The tailor recognizes no aphelion or perihelion in his custom: the thin woollen suit which his patron had made in April is comfortably worn until April again. The Atlantic Monthly, Volume 13, No. 80, June, 1864 In 1892 the comet ought again to have returned to perihelion, but in that year no meteors were seen on the 27th November, while many were seen on the 23rd from the same radiant. The Story of the Heavens At the perihelion the planet is urged from the sun and at the aphelion towards the sun. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence It was not, however, until September 1, 1883, that Mr. Brooks caught its reappearance; it passed perihelion January 25, and was last seen June 2, 1884. A Popular History of Astronomy During the Nineteenth Century Fourth Edition We were flying now, flying as comets fly to perihelion. The Wit and Humor of America, Volume IV. (of X.) And, as it falls, like any other falling body it gains in speed, until, having reached the perihelion point, its terrific velocity counteracts its approach and it begins to recede. Other Worlds Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries That's why we have our golf season while Mars is in his perihelion. Olympian Nights The tangent of a comet’s orbit, also, can only be tangential to the circular motion of the ether at and near perihelion, which is a very small portion of its period of revolution. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence As the size of the nucleus contracted with approach to perihelion, its intensity augmented. A Popular History of Astronomy During the Nineteenth Century Fourth Edition It was, indeed, only seen during its return, having, like the comet of 1668, been only discovered a day or two after perihelion passage. Scientific American Supplement, No. 633, February 18, 1888 From these telltale plates it was ascertained that in 1894 it had been in perihelion very near the earth, and had shone with the brilliance of a seventh-magnitude star. Other Worlds Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries Motion of the perihelion of the terrestrial orbit.—The major axis of the orbit of each planet is in a state of continual movement from the disturbing action of the other planets. Biographies of Distinguished Scientific Men But there is this peculiarity about it, which adds strength to our theory: “The Constant of Resistance” requires a change after perihelion. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence Can it be possible," Mr. Hind wrote to Sir George Airy, "that there is such a comet in the system, almost grazing the sun's surface in perihelion, and revolving in less than thirty-seven years. A Popular History of Astronomy During the Nineteenth Century Fourth Edition The relative dimensions and presentation of Mars, as seen in opposition in perihelion, and in opposition in aphelion, are shown in the two rows of figures. Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction. When in aphelion, or at its greatest distance, Eros is outside of the orbit of Mars, but when in perihelion it is so much inside of Mars's orbit that it comes surprisingly near the earth. Other Worlds Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries In the case of the earth's orbit, the perihelion is slowly advancing in the same direction as that in which all the planets are revolving around the sun. Biographies of Distinguished Scientific Men But when the orbits become very eccentrical, we must consider this force as momentarily affecting a comet’s velocity, diminishing it as it approaches the perihelion, and increasing it when leaving the perihelion. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence The observations secured were indeed, from the nature of the apparition, neither numerous nor over-reliable; and the earliest of them dated from a week after perihelion, passed, almost by a touch-and-go escape, January 11. A Popular History of Astronomy During the Nineteenth Century Fourth Edition Mars in perihelion always turns his south pole towards the sun and therefore towards the Earth. The Birth-Time of the World and Other Scientific Essays Now, being swept along by the comet, whose perihelion probably lay in the immediate neighborhood of the sun, I saw no way of escape from the frightful fate of being broiled alive. Other Worlds Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries The Earth when nearest to the Sun, is in her perihelion; when most distant, in her aphelion. All Around the Moon There is also a correction necessary for the perihelion distance, and another for the tangential current; but we are only considering here the general effect. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence Its abrupt display of vitality occurred two full months after perihelion. A Popular History of Astronomy During the Nineteenth Century Fourth Edition At its perihelion it travels thousands of leagues per minute; at its aphelion it does not pass over more than a few yards. Young Folks' Library, Volume XI (of 20) Wonders of Earth, Sea and Sky This makes the sun appear twice as large, bright, and hot as seen and felt on Mercury at its perihelion than at its aphelion. Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work This comet, therefore, which, according to Goldschmidt, passes beyond the orbit of Jupiter, is one of the few whose perihelia are beyond Mars. COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 Hence the necessity of changing the “Constant of Resistance” after perihelion, and this will generally be found necessary in all cometary orbits, if this theory be true. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence The missing comet was next due at perihelion in the year 1872, and the probability was contemplated by both Weiss and Galle of its being replaced by a copious discharge of falling stars. A Popular History of Astronomy During the Nineteenth Century Fourth Edition On the 17th of December, 1680, it was at its perihelion—that is, at its greatest proximity to the Sun; it is now continuing its path beyond the Neptunian orbit. Young Folks' Library, Volume XI (of 20) Wonders of Earth, Sea and Sky Mean distance of a planet, half the sum of the aphelion and perihelion distances. Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work Perhaps It is in aphelion that the corona appears most splendid; Were perihelion to result is coalescence, perhaps the photosphere would be proved composed of terrestrial vapors. Hints for Lovers When the angle between the perihelion and the nearest node increases, the mean force of the radial stream is diminished, and the mean distance is diminished also. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence For the perihelion distance of the comet of 1882, though somewhat greater than that of its predecessors, was nevertheless extremely small. A Popular History of Astronomy During the Nineteenth Century Fourth Edition The comet returned at the appointed time; and on the 12th of March, 1759, reached its perihelion. Young Folks' Library, Volume XI (of 20) Wonders of Earth, Sea and Sky Apsis, plural apsides, the line joining the aphelion and perihelion points; or the major axis of elliptical orbits. Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work Since the orbit of the earth is elliptical, and the sun is situated at one of its foci, the earth is nearly 3,000,000 miles further from the sun in aphelion than in perihelion. Burroughs' Encyclopaedia of Astounding Facts and Useful Information, 1889 Now let us remember that the density of the ether at a comet’s aphelion, is greater than at the perihelion, in the direct ratio of the square roots of the distances from the sun nearly. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence This, the sole comet of 1866, slipped past perihelion, January 11, without pomp of train or other appendages, and might have seemed hardly worth the trouble of pursuing. A Popular History of Astronomy During the Nineteenth Century Fourth Edition On the following day the sun, declining in perihelion, produces the customary inequality. Mince Pie It will be looked for in 1911; and there is good hope of predicting, long before it is seen, the time of its perihelion within a day. Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work That is its nearest approach,—its perihelion, in relation to ourselves; and it is precisely two and three-quarters miles distant from Mavis Bush,—the name of our cottage. The Atlantic Monthly, Volume 12, No. 71, September, 1863 We may also conceive, that the continual siftings which the nucleus undergoes at each successive perihelion passage, have left but little of those lighter elements in comets whose mean distances are so small. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence The appendage, however, attained its full development only after perihelion, September 30, by which time, too, it lay nearly square to the line of sight from the earth. A Popular History of Astronomy During the Nineteenth Century Fourth Edition Although his popularity, due, in part at least, to the extravagance of over-zealous admirers, has without much doubt already passed its perihelion, it can never disappear or greatly diminish. The Abolitionists Together With Personal Memories Of The Struggle For Human Rights Hence each planet is nearer to the sun at one part of its orbit than another; that point is called the perihelion, and the farthest point aphelion. Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work It lands on his solar every morning about nine o'clock, gettin' worse steady, and reaches perihelion along about eleven. Pardners We have, also, a satisfactory explanation of the rapid formation of the tail; of its being wider and fainter at its extremity; of its occasional curvature; and of its greater length after perihelion than before. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence His object in making the experiment was to ascertain the temperature encountered by the comet of 1680 at its passage through perihelion. A Popular History of Astronomy During the Nineteenth Century Fourth Edition The photograph was made last December, when I was, so to speak, at my perihelion in the matter of avoirdupois. Eugene Field, a Study in Heredity and Contradictions — Volume 2 At that epoch the earth was in her perihelion, and the month of December is so propitious to these shooting stars that astronomers have counted as many as 24,000 an hour. The Moon-Voyage "Keep comet to three sticks," comes the order, and the comet's perihelion is abbreviated. Essays in Rebellion But, more especially may we point to the explanation which this theory gives of the fact, that, ceteris paribus, the long-period comets, when their perihelion distances are small, have tails of such exaggerated dimensions. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence When the earth is nearest the sun she is in her perihelion; and in her aphelion at the farthest point. From the Earth to the Moon; and, Round the Moon It is a constant quantity, and only unequally distributed on the earth's surface, being neither increased nor diminished, as our winters occur in aphelion or perihelion. Life: Its True Genesis It has been calculated that at its perihelion, when nearest to the sun, the earth would have borne a heat equal to 28,000 times that of summer. The Moon-Voyage But if the first day of the perihelion overwhelms us with difficulty, the second day will prove disastrous to the common theory. Scientific American Supplement, No. 433, April 19, 1884 The position of the comet, October 9th, is at C, approaching its perihelion; that of the earth at the same time at T; while S represents the sun, and SQ the line of equinoxes. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence At this period the earth was in its perihelion, and the month of December is so propitious to these shooting stars, that astronomers have counted as many as twenty-four thousand in an hour. From the Earth to the Moon; and, Round the Moon But it is always there, and whether soft in the gentler periods, or strong amidst the noise and clang of the perihelion, it dominates always and gives its tone to the whole life. With Edged Tools When the earth is nearest the sun she is at her perihelion, and at her aphelion when most distant. The Moon-Voyage There is no difficulty in accounting for the rise and fall of the tail at perihelion, nor for the tail preceding the nucleus afterward. Scientific American Supplement, No. 433, April 19, 1884 The grand comet of 1556 is now probably approaching, and, from recent investigations, it appears that it will arrive at its perihelion in 1858,—subject to an error either way of about two years. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence "But," continued Nicholl, "Before becoming the earth's satellite, could not the moon, when in her perihelion, pass so near the sun as by evaporation to get rid of all those gaseous substances?" From the Earth to the Moon; and, Round the Moon This proved that the meteor cluster was at perihelion. History of Astronomy The season wore on to its perihelion—a period, the scientific books advise us, of the highest clang and crash of speed and whirl, of the greatest brilliancy and deepest glow of a planet's existence. The Sowers Are we to attribute in any degree the different appearances of the sun's corona to the presence or absence of a comet at its perihelion? Scientific American Supplement, No. 433, April 19, 1884 The elements of the strange orb were immediately calculated, and it was at once conceded by all observers that its path, at perihelion would bring it into very close proximity with the earth. Edgar Allan Poe's Complete Poetical Works What had happened was that the comet in passing its perihelion point had swung exactly between the earth and the sun. Curiosities of the Sky The art has also been applied to the observation of comets at distances from their perihelia so great as to prevent their visual observation. History of Astronomy The third period of the perihelion passage had then passed, and nothing had been seen of the missing luminary. Ragnarok : the Age of Fire and Gravel Between these dates, especially for some years after 1910, the position of the planet in the sky will be the most favorable, being in northern declination, near its perihelion, and having its rings widely open. Side-Lights on Astronomy and Kindred Fields of Popular Science The Jigger episode had done much, had altered the latitudes of their association, but the perihelion of their natures was still far off; and she was apprehensive, watchful, and anxious. The Judgment House Strength was lent to this hypothesis by the fact that the comet of 1882 was apparently torn asunder during its perihelion passage, retreating into space in a dissevered state. Curiosities of the Sky Still," he adds, "during extreme excentricity the sun would make great efforts to compensate in perihelion for the chill of a long winter in aphelion in one hemisphere, and a cool summer in the other. More Letters of Charles Darwin — Volume 2 The perihelion of this dance seems, indeed, to have been in the reign of Charles II. Yet Again These tables have, however, been deviating from the true motion of the planet, owing to the motion of the perihelion of Mercury, subsequently discovered by Le Verrier himself. Side-Lights on Astronomy and Kindred Fields of Popular Science The elements of the strange orb were immediately calculated, and it was at once conceded by all observers, that its path, at perihelion, would bring it into very close proximity with the earth. The Works of Edgar Allan Poe — Volume 4 At the calculated acceleration, the head of the meteor-stream must very soon pass perihelion. The Education of Henry Adams The right lobe of the perihelion has subsided. The Gentle Grafter The planets nearest the sun receive such burning rays that their surfaces are red-hot, and at the equator at perihelion are molten. A journey in other worlds A romance of the future The perihelion distance from the sun, which settled the precise form of the parabola. Off on a Comet! a Journey through Planetary Space Whether this heat was the result of collision or of its near approach to the sun at perihelion, they could not tell, though the latter explanation seemed most simple and probable. A journey in other worlds A romance of the future The direction of the axis major of the orbit, which was found by calculating the longitude of the comet's perihelion. Off on a Comet! a Journey through Planetary Space Without noticing the interruption, Servadac continued his own remarks, "The comet then, I see, is to reach its aphelion on the 15th of January, exactly a twelvemonth after passing its perihelion." Off on a Comet! a Journey through Planetary Space At perihelion there would simply be increased evaporation and clouds near the equator, which would shield those regions from the sun, only to disappear again as the earth receded. A journey in other worlds A romance of the future You think, then," said Servadac, with a smile, "you have determined the perihelion of our orbit; but how about the aphelion? Off on a Comet! a Journey through Planetary Space |
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