| 单词 | sidereal day |
| 释义 | > as lemmassidereal day sidereal day n. Astronomy (originally) the time between successive passes of the sun past the same point in the fixed stars; (in later use) the time between successive passes of the vernal equinox across the same celestial meridian; the time it takes for the earth to make one rotation relative to this equinox.The sidereal day is about four minutes shorter than the solar day, having a length of 23h 56m 4.1s. ΚΠ a1678 J. Newton Cosmographia (1679) 374 The Æquinoctial day being 24 hours, the sydereal day is 24 hours, 00′. 00″. 00‴. 32iv. 51. 15. 9. 14 24. 1807 T. Young Course Lect. Nat. Philos. I. xlviii. 597 He supposed the earth to remain at rest in the centre, the stars to revolve round it, together with the sun and all the planets, in a sidereal day. 2001 P. Moore 2002 Yearbk. Astron. i. 14 Because the sidereal day is shorter than the solar day, the stars appear to rise and set about four minutes earlier each day. < as lemmas |
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