| 单词 | tropical year |
| 例句 | The basic period of revolution of Earth, called the tropical year, is 365.2422 days. Astronomy 2016-10-13T00:00:00Z This rate is known as the mean tropical year. What Day Is Doomsday? How to Mentally Calculate the Day of the Week for Any Date 2011-10-18T10:15:00.247Z This made three days taken off the 400 years, and in consequence the mean value of the civil year is reduced to 365·2425 days, which is not far from the true tropical year. Astronomical Myths Based on Flammarions's History of the Heavens 2011-06-24T02:00:15.873Z It is called a tropical year with reference to the circuit which the sun makes from one tropic to the other and back again. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z The tropical year being thus ascertained, their tables showed the exact time of the equinox or sun's transit across the equatorial, and of the solstice. The Story of Extinct Civilizations of the West The second feature of the new Gregorian calendar was a change in the rule for leap year, making the average length of the year more closely approximate the tropical year. Astronomy 2016-10-13T00:00:00Z The true number of days in the mean tropical year actually varies slightly over time. What Day Is Doomsday? How to Mentally Calculate the Day of the Week for Any Date 2011-10-18T10:15:00.247Z This would indeed be the case if the mean value of the civil year of the Julian calendar was exactly equal to the tropical year. Astronomical Myths Based on Flammarions's History of the Heavens 2011-06-24T02:00:15.873Z Accurate observations with the elaborate apparatus used by professional astronomers show that this period, which is called a tropical year, is 365 days 5 hours 48 minutes 46 seconds. A Text-Book of Astronomy 2011-01-05T03:00:57.347Z A tropical year is, however, about six hours longer than three hundred and sixty-five days, and by throwing away six hours annually, there would be an entire day lost every four years. Incentives to the Study of the Ancient Period of American History An address, delivered before the New York Historical Society, at its forty-second anniversary, 17th November 1846 The tropical year is the interval from one season till the return of that season again—spring to spring, summer to summer, autumn to autumn, or winter to winter. The Astronomy of the Bible An Elementary Commentary on the Astronomical References of Holy Scripture The Julian calendar approximated the mean tropical year as 365.25 days and proposed 366-day leap years for every one divisible by four. What Day Is Doomsday? How to Mentally Calculate the Day of the Week for Any Date 2011-10-18T10:15:00.247Z By taking this amount from the sidereal we obtain the tropical year, which has reference to the seasons and the calendar. Astronomical Myths Based on Flammarions's History of the Heavens 2011-06-24T02:00:15.873Z The space of time in which the earth passes through her orbit—distinct from and longer than the tropical year, owing to the precession of the equinoxes. 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 scheme itself denotes, not only a very certain mode of keeping the record of time, but a very exact knowledge of the tropical year. Incentives to the Study of the Ancient Period of American History An address, delivered before the New York Historical Society, at its forty-second anniversary, 17th November 1846 In the long run, it gave an accurate value for the mean tropical year, and avoided all the astronomical difficulties of the question. The Astronomy of the Bible An Elementary Commentary on the Astronomical References of Holy Scripture All these astounding changes had come to pass through the heat and moisture of a tropical year, and under deliberate scientific calculation there was nothing unusual in the alteration. Edge of the Jungle And now, by a variety of indications, it was manifest that the winter of the tropical year was at hand. The Island Home It is true that, under the strain of the long tropical years, his bodily health declined as he approached the age of sixty. Some Diversions of a Man of Letters Theory, however, indicates that for ages past the rate of regression has been slowly increasing, and, consequently, the length of the tropical year has been gradually diminishing. Biographies of Distinguished Scientific Men The later Babylonians used a tropical year dependent on the actual observation of the spring equinox. The Astronomy of the Bible An Elementary Commentary on the Astronomical References of Holy Scripture He altered the length of the tropical year from 365 days, 6 hours to 365 days, 5 hours, 53 minutes—still four minutes too much. History of Astronomy It was now the spring of the tropical year: the deciduous trees were renewing their verdure, and were covered with young shoots, and bursting leaf-buds. The Island Home Some have maintained that the obelisks which the Egyptians erected served the purpose of gnomons for determining the obliquity of the ecliptic, the altitude of the pole, and the length of the tropical year. Beacon Lights of History, Volume 03 Ancient Achievements Consequently, the length of the tropical year is now about ten seconds less than it was in the time of Hipparchus. Biographies of Distinguished Scientific Men There is a detail in the history of the flood in Gen. vii. and viii. which has been taken by some as meant to indicate the length of the tropical year. The Astronomy of the Bible An Elementary Commentary on the Astronomical References of Holy Scripture Some have maintained that the obelisks which they erected served the purpose of gnomons, for determining the obliquity of the ecliptic, the altitude of the pole, and the length of the tropical year. The Old Roman World, : the Grandeur and Failure of Its Civilization. Thus the Babylonians had fixed the length of a tropical year within twenty-five seconds of the truth; their estimate of the sidereal year was barely two minutes in excess. History of the Conflict Between Religion and Science Laplace found that the extent to which the tropical year is liable to vary from this cause, amounts to thirty-eight seconds. Biographies of Distinguished Scientific Men Limits of variation of the tropical year modified by the disturbing action of the sun and moon upon the terrestrial spheroid.—The tropical year will not continue indefinitely to diminish in length. Biographies of Distinguished Scientific Men The Babylonian basic number, 60, would have given—as will be seen from the table in the last chapter—a distinctly less accurate correspondence between the month and the tropical year. The Astronomy of the Bible An Elementary Commentary on the Astronomical References of Holy Scripture If the movement of the equinoctial points arising from these combined causes was uniform, the length of the tropical year would be manifestly invariable. Biographies of Distinguished Scientific Men |
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