| 单词 | tropical year |
| 释义 | > as lemmastropical year tropical year n. [after post-classical Latin annus tropicus (1560 or earlier; also tropicus annus (1556 or earlier))] the interval between two successive passages of the sun through the same solstitial or equinoctial point; a year as reckoned from one (winter or summer) solstice or one (vernal or autumnal) equinox to the next. ΚΠ ?1574Tropical year [see sense A. 1b]. 1612 A. Hopton Concordancy of Yeares xx. 63 The Tropicall yeare taketh his beginning from the Vernall Equinox, containing 365 dayes, 5 houres, 49 minuts, 15 seconds, and 46 thirds, but the vnequall or aparent Tropical yeare containes sometime more..and other times lesse..: And this vnequality is made by the vnequall precession of the Equinoctiall points. 1715 tr. D. Gregory Elements Astron. I. iii. §12. 408 The Tropical Year is that space of time wherein the same Seasons of the Year return again. 1844 H. Browne Ordo Sæclorum 525 Mr. Greswell sets out with a confused fancy that these day-names are somehow so necessarily connected with the tropical year, that the Julian year has no right to them. 1921 D. N. Mallik Elem. Astron. xiv. 218 In order that 400 years of the (corrected) calendar should be equal (nearly) to 400 tropical years, it is necessary to drop 3 leap years. 2005 L. Holford-Strevens Hist. Time ii. 21 Owing to precession, the tropical year is somewhat shorter than the sidereal year. < as lemmas |
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