| 单词 | sidereal period | 
| 释义 | > as lemmassidereal period   sidereal period  n. Astronomy the period between two successive passes of a celestial object past the same point in the celestial sphere (the fixed stars), as seen from the earth; (equivalently) the time taken by an orbiting object to make one revolution around its primary, as observed relative to the celestial sphere.The sidereal period of the moon is a sidereal month (the earth being its primary); that of the earth is a sidereal year (the sun being its primary). ΚΠ 1768    Philos. Trans. 1767 		(Royal Soc.)	 57 399  				If the earth stood still, the spots would be hid only 13d. 23h. 10′, and their whole sidereal period being 25d. 5h. they would be visible 11d. 5h. 50′. 1875    Good Words 16 238/1  				This is the sidereal period of the moon's revolution; not the synodic period, as the time from new moon to new moon is called. 1970    Jrnl. Brit. Astron. Assoc. 80 184  				For Venus the commensurabilities are as follows: 13 sidereal periods of Venus = 8 sidereal years − 0.94 day [etc.]. 2009    M. Heley Everything Guide to 2012 vi. 71  				The sidereal period of the moon is roughly twenty-seven days and the synodic is roughly twenty-nine days. < as lemmas  | 
	
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