| 单词 | annual equation |
| 释义 | > as lemmasannual equation annual equation n. Astronomy a discrepancy in the observed position of the sun or moon in the sky, compared to its theoretical position or mean motion, that varies regularly over the course of a year; spec. (the magnitude of) the varying difference in the observed celestial longitude of the moon arising from perturbation by the sun's gravity as the earth–moon system passes from aphelion to perihelion and back. ΘΚΠ the world > the universe > cosmology > science of observation > astronomical calculation > [noun] prosthaphaeresis1599 annual equation1700 lunar equation1712 metemptosis1728 1700 I. Newton MS Cambr. Add. 3966 in Corr. (1967) IV. 323 The annual equation of the Suns motion arises from ye excentricity of his Orb wch is 16 11/ 12 supposing the radius of that Orb to be 1000. 1728 E. Chambers Cycl. (at cited word) The annual Equation of the mean Motion of the Sun depends on the Eccentricity of the Earth's Orbit... The greatest annual Equation of the Moon's mean Motion is 11′, 40″. of its Apogee 20′, and of its node 9′, 30″. 1849 M. Somerville On Connexion Physical Sci. (ed. 8) v. 41 The Annual Equation [of the moon] depends on the sun's distance from the earth; it arises from the moon's motion being accelerated when that of the earth is retarded. 1967 Publ. Astron. Soc. Pacific 79 485 The history of Tycho's last addition to the lunar theory—the annual equation—is so involved that it cannot be summarized here. 2012 W. Applebaum in tr. J. Horrocks Venus seen on Sun Introd. p. xxii It is not true that neither Kepler nor Tycho Brahe assigned a value to the Moon's annual equation. < as lemmas |
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