| 单词 | right ascension |
| 例句 | But the flight control team can read out data describing the orientation of the telescope — for example, “32 degrees right ascension, 12 degrees declination.” Webb telescope is already challenging what astronomers thought they knew 2022-08-26T04:00:00Z Instead of latitude and longitude, however, astronomers use coordinates called declination and right ascension. Astronomy 2016-10-13T00:00:00Z This event is also a conjunction, which in astronomy means that the planets share the same right ascension. Astronomical events in 2019 2019-01-06T05:00:00Z Bessel’s practice was to unclamp in declination, lower and read off the head, and then restore the telescope to its former declination reading, the clockwork meanwhile following the stars in right ascension. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z While the right ascensions of the solar apex as given by the different investigations have been pretty uniform, the declination of this point has shown a rather wide variation not yet explained. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z The measurements that correspond in astronomy to terrestrial latitude and longitude are called declination and right ascension and are obviously made with reference to the celestial equator, not the ecliptic. Astronomical Lore in Chaucer 2011-10-13T02:00:42.860Z What is the right ascension and declination of the vernal equinox? Astronomy 2016-10-13T00:00:00Z In fact, I think I may say without violating any confidence, that it is the initial point from which the right ascensions and the longitudes of the heavenly bodies are measured. Of All Things 2011-10-09T02:00:26.957Z By adjusting the right ascension of the plane ABC and rotating the axis with the angular velocity of the sun, it follows that BC will be the direction of the solar rays throughout the day. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z Hipparchus was an accurate observer, and he discovered an apparent and perpetual shifting of the vernal equinox westward, by which the right ascensions of the stars are all the time increasing. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z Hence the sun was in three degrees of Aries—confirmed in Canace's expedition on the following morning, when he was "in the Ram foure degrees yronne," and his corresponding right ascension was twelve minutes. Notes and Queries, Vol. III, Number 83, May 31, 1851 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Geneologists, etc 2011-07-26T02:00:17.693Z What is the right ascension and declination of the autumnal equinox? Astronomy 2016-10-13T00:00:00Z The inner vernier is then set to the right ascension of the object which it is desired to observe. Photographs of Nebul? and Clusters Made with the Crossley Reflector 2011-06-21T02:00:27.500Z The pit and the chief-lover and the lamplighter were turned by astonishment into lumps of ice, as they saw the tailed comet go up in right ascension to the gallery. Hesperus or Forty-Five Dog-Post-Days Vol. II A Biography 2011-05-14T02:00:08.440Z Then the observation of a star's longitude and latitude, as referred to the ecliptic plane, could be made, quite as well as that of right ascension and declination on the equatorial plane. Astronomy: The Science of the Heavenly Bodies 2012-03-17T02:01:02.630Z The two axes carry graduated circles, with the help of which, even during the day, the telescope can be pointed to any star whose declination and right ascension are known. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z What is the right ascension and declination of the Sun at noon on the summer solstice in the Northern Hemisphere? Astronomy 2016-10-13T00:00:00Z The right ascension slide is then always at right angles to the telescope axis, and the eye-end can not get into an inaccessible position during a long exposure. Photographs of Nebul? and Clusters Made with the Crossley Reflector 2011-06-21T02:00:27.500Z Can you identify bright and faint stars from their designations or right ascensions and declinations? A Plan for Securing Observations of the Variable Stars 2011-03-20T02:00:35.713Z The motion of the pole of course carries the equator and the equinoxes with it, and thus slowly changes the right ascensions and declinations of all the stars. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z It had two stout brass right ascension circles divided to 10 seconds, and declination circles divided to 5 minutes of arc. The Life of Roger Langdon Told by himself. With additions by his daughter Ellen. [With a preface by H. Clifton Lambert.] 2010-12-21T22:55:56.210Z We have already mentioned that in astronomical practice right ascensions are expressed in time, so that no multiplication by 15 is necessary. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" With a little practice, however, one can wind the clock without actually stopping it, though the object must afterwards be brought back to its place by means of the slow motion in right ascension. Photographs of Nebul? and Clusters Made with the Crossley Reflector 2011-06-21T02:00:27.500Z On the other hand, they are to be added to the same in the second and fourth quadrant, as is noted in their respective places, according to the theory of right ascensions. The Borghesi Astronomical Clock in the Museum of History and Technology Contributions from the Museum of History and Technology, Paper 35, the Smithsonian Institution United States National Museum Bulletin 240 The middle of this period may be taken as the time at which the star crossed the meridian and at this moment the sidereal time is equal to the right ascension of the star. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z Gauges of this kind were made in all parts of the sky, and the results were tabulated in the order of right ascension. Sir William Herschel: His Life and Works The difference between these times, when reduced to an angle, is the difference of the right ascensions of the stars. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" Outside this position the image changes to an arrow-head, the point of which is directed toward the axis, and this image can be very accurately bisected by the right ascension thread. Photographs of Nebul? and Clusters Made with the Crossley Reflector 2011-06-21T02:00:27.500Z As the book was not written for those who possess the equipment of an observatory, with telescopes driven by clockwork and provided with graduated circles, right ascensions and declinations are not given. Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers It is in this way that astronomers measure the right ascensions of the stars and planets. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z As he gives her the word, she writes down the declination and right ascension, and the other circumstances of the observation. Pioneers of Science This instrument moves only in the plane of the meridian on a horizontal east and west axis, and is used to determine the right ascensions and declinations of stars. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" He invented the sciences of plane and spherical trigonometry, and was the first to use right ascensions and declinations. The Astronomy of Milton's 'Paradise Lost' Reflectors are brilliant engines of discovery, but they lend themselves with difficulty to the prosaic work of measuring right ascensions and polar distances. A Popular History of Astronomy During the Nineteenth Century Fourth Edition Does the apparent motion of a star change its declination or right ascension? A Text-Book of Astronomy 2011-01-05T03:00:57.347Z Or, instead of direct observation by alignment with known stars, it is easier to look out its right ascension and declination in Whitaker's Almanac, and plot those down. Pioneers of Science The latter motion leads to the use, in astronomical practice, of time instead of angle, as the unit in which the right ascensions are to be expressed. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" This is α Arietis, the first point in the constellation of that name, which signifies the Ram, and from which the right ascensions of the stars are measured on the celestial sphere. The Astronomy of Milton's 'Paradise Lost' The outcome, accordingly, was an apex most likely correctly placed as regards right ascension, but displaced southward by some fifteen degrees. A Popular History of Astronomy During the Nineteenth Century Fourth Edition Will the precession ever bring back the right ascensions and declinations to be again what they now are? A Text-Book of Astronomy 2011-01-05T03:00:57.347Z For instance, the position of a place on the earth is fixed by its latitude and longitude; the position of a heavenly body is fixed by its declination and right ascension. Lectures in Navigation For example, if the right ascension of a star is exactly 15�, it will pass the meridian one sidereal hour after the vernal equinox. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" The right ascension circle reads to 5 min., the declination circle to single degrees. Astronomical Instruments and Accessories Mr. Denning's observations of these yellowish, leisurely meteors extend over nearly six weeks, from July 8 to August 16; the point of radiation meantime progressing no less than 57° in right ascension. A Popular History of Astronomy During the Nineteenth Century Fourth Edition Exercise 10.—The right ascension of the sun may be found by observing with the sidereal clock the time of its transit over the meridian. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z At first she could not believe her eyes; then hoping and doubting, scarcely daring to think that she had really made a discovery, she obtained its right ascension and declination. The Girl Wanted A friend of mine—at least until he misbehaved—insisted on the mean right ascensions: but I served him as Abraham served his guest in Franklin's parable. A Budget of Paradoxes, Volume II The handles for all clamps and slow motions are fastened conveniently near the eye end of the telescope and are of different shape so as to distinguish in the dark right ascension and declination. Astronomical Instruments and Accessories Is the moon in conjunction with the sun at the time of new moon, both luminaries having then the same longitude, or right ascension. 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. The right ascension and declination of the sun as observed on each day should be plotted on the map and the date, written opposite it. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z Its right ascension was 0° 26⅖´ and its declination 61° 46¾´. The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler Bradley, the modern Hipparchus, carried on the improvement, his errors in right ascension, according to Bessel, being under one second of time, and those of declination under four seconds of arc. Human Traits and their Social Significance The positions in B. D. are given in tenths of a second in right ascension and in tenths of a minute in declination. Lectures on Stellar Statistics The change produced in the right ascension or declination of a star by the precession of the equinoxes and proper motion of the star taken together. 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. It plays the same part in measuring right ascensions as does the meridian of Greenwich in measuring longitudes; it is the beginning, from which they are reckoned. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z Meantime the estimated movement in three days was 10″ in right ascension, and about a minute, or rather less, towards the north. Notes and Queries, Number 54, November 9, 1850 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. This motor governs the hour motion, that one the right ascension. Skylark Three The catalogue is arranged in accordance with the declination-degrees, and for each degree according to the right ascension. Lectures on Stellar Statistics The commencement of this sign, called the first point of Aries, is the origin from which the right ascensions of the heavenly bodies are reckoned upon the equator, and their longitudes upon the ecliptic. 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. The sidereal time at any moment is the right ascension of the hour circle which at that moment coincides with the meridian. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z According to my figures, it ought to be about four hours right ascension, and something like plus twenty degrees declination. Spacehounds of IPC Declination about minus twenty, as I remember it, and right ascension between six and seven hours. Skylark Three It should be remembered that the first four figures give the hour and minutes in right ascension, the last two the declination, italics showing negative declination. Lectures on Stellar Statistics It is the sum or difference of the right ascension and ascensional difference. 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. The difference between the observed time and the right ascension, if any is found, is the "correction" of the clock. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z In these lists of meteors, the radiant point is only approximately given; for scientific purposes a far more exact position is required in terms of right ascension and declination. A Field Book of the Stars It's about twelve and a quarter light years distant, right ascension about eighteen hours, declination around plus fifteen degrees. Man of Many Minds Could not Dr. Alexander write a Sabbath-school book, without filling it full of such phrases as "right ascension," "declination," "precession of the equinoxes," "radius vector," and the like? Fables of Infidelity and Facts of Faith Being an Examination of the Evidences of Infidelity Taking the differences of right ascension and declination between a comet and a star, the position of which has been already determined. 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 is the right ascension of the star, and U is the correction of the clock. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z In the spherical triangle given on next page, we have given the point A, being the position of the moon in right ascension and declination in the heavens, and considered as terrestrial latitude and longitude. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence The hours of right ascension and the degrees of declination are the main things to be noticed. Other Worlds Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries The circles c and d serve to indicate, by means of verniers revolving with the axes, the motion of the telescope in right ascension and declination, respectively. Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction. An instrument of large radius for finding the difference in the right ascension and declination of two heavenly bodies. 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. For exact location of a star, right ascension and declination must be given; but for general indication its name or place in a constellation is sufficiently exact. Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work Having, therefore, the right ascension of A, and the right ascension of L, we have the angle P. This gives us two sides, and the included angle, to find the side LA. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence Note well, also, these particulars about the charts: Chart No. 1 includes the first four hours of right ascension, from 0 h. to 4 h. inclusive; Chart No. 2 includes 4 h. to 8 h.; Other Worlds Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries If two cross-rods are used, account must be taken of the gradual diminution in the length of a degree of right ascension as we leave the equator. Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction. The Albany proper motions, as Prof. Boss was careful to explain, depend for the most part upon the right ascensions of Bessel's and Lalande's zones, and are hence subject to large errors. Scientific American Supplement, No. 829, November 21, 1891 Adjacent to these "finder" diagrams are the settings—to the nearest minute of arc in declination, and of time in right ascension—as read from the large finding-circles, divided in black and white. Scientific American Supplement, No. 530, February 27, 1886 To find a star in the heavens, look up its declination and right ascension in an atlas. The Boy Mechanic: Volume 1 700 Things for Boys to Do The entire circuit of the heavens along the equator is divided into twenty-four hours of right ascension, each hour covering 15° of space. Other Worlds Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries The equatorial can be directed by means of the 20circles c and d to any celestial object whose right ascension and declination are known. Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction. The meridian, from which the right ascension is calculated, is marked in this century by four stars—the Polar, Cassiopeia's Chair, Andromeda's Head, and the star Algenib, which is in Pegasus. The Man Who Laughs On the evening of the 5th its right ascension was found to be about 0 hours 13 minutes 0 seconds, and declination about 13 degrees 0 minutes South. Discoveries in Australia, Volume 2 Discoveries in Australia; with an Account of the Coasts and Rivers Explored and Surveyed During the Voyage of H.M.S. Beagle, in The Years 1837-38-39-40-41-42-43. By Command of the Lords Commissioners Of the Admiralty. Also a Narrative of Captain Owen Stanley's Visits To the Islands in the Arafura Sea Add the clock time to the hour reading to get right ascension. The Boy Mechanic: Volume 1 700 Things for Boys to Do Opposite the 15th day of the month I find the right ascension to be 18 h. Other Worlds Their Nature, Possibilities and Habitability in the Light of the Latest Discoveries Maria has obtained its right ascension and declination, and will not suffer me to announce it. Lives of Girls Who Became Famous The first cycle, covering the entire sky from zero to twenty-four hours of right ascension, has been completed. Scientific American Supplement, No. 601, July 9, 1887 It contains the right ascension, declination, and azimuth index, all neatly carved upon slate. Men of Invention and Industry The motion in right ascension is sometimes communicated by clockwork, so as to keep the object constantly in the field of the telescope. The Gutenberg Webster's Unabridged Dictionary Section D and E One such star, however, with a right ascension nearly equal to that of g Draconis, but in thc opposite sense, was selected and kept under observation. The Project Gutenberg Encyclopedia Volume 1 of 28 Already the night before, and the same morning, by raking different altitudes, and by means of a calculation of right ascensions, the Lieutenant and the astronomer had ascertained the longitude with great accuracy. The Fur Country Seventy Degrees North Latitude He introduced new methods for determining the position of the equinox and the right ascension of a fundamental star. History of Astronomy I made my patterns, got them cast, turned and fitted them myself, grinding all the working parts together with emery and oil, and fitted a tangent-screw motion to drive the instrument in right ascension. Men of Invention and Industry He determined," says Delambre, "the position of the stars by right ascensions and declinations, and was acquainted with the obliquity of the ecliptic. Beacon Lights of History, Volume 03 Ancient Achievements It does not bear illumination, but Maria has obtained its right ascension and declination, and will not suffer me to announce it. Maria Mitchell: Life, Letters, and Journals They ascertained the position of the stars by right ascension and declination. The Old Roman World, : the Grandeur and Failure of Its Civilization. He was also the first to introduce the use of Huyghens’s clocks for observing the right ascension of stars. History of Astronomy The two apices differ very nearly 180° in right ascension and about 120° in declination. Curiosities of the Sky To recognize it, it is necessary to have an astronomical ephemeris showing its right ascension and declination, and star maps showing where the parallels of right ascension and declination lie among the stars. Side-Lights on Astronomy and Kindred Fields of Popular Science With the clock and chronograph they determine difference of right ascension of objects by the electric mode of recording. Maria Mitchell: Life, Letters, and Journals He determined," says Delambre, "the position of the stars by right ascensions and declinations; he was acquainted with the obliquity of the ecliptic. The Old Roman World, : the Grandeur and Failure of Its Civilization. Dudley at Albany, in the state of New York, and West Point, the military academy, showed that their colleagues were wrong by an elaborate calculation of the right ascension and declination of the aforesaid body. Robur the Conqueror The Copley medal was awarded to James South, Esq. for his observations of double stars, and his paper on the discordances between the sun's observed and computed right ascensions, published in the Transactions. Reflections on the Decline of Science in England For the sun we have its longitude, right ascension, and declination, all expressed in arc and not in time. Side-Lights on Astronomy and Kindred Fields of Popular Science The right ascensions and declinations of the moon and the lunar distances are also given for intervals of twelve hours. Side-Lights on Astronomy and Kindred Fields of Popular Science |
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