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Oxford
Adj.
Sidereal clock a clock showing sidereal time. sidereal day thetime between successive meridional transits of a star or esp.of the first point of Aries, about four minutes shorter than thesolar day. sidereal time time measured by the apparent diurnalmotion of the stars. sidereal year a year longer than the solaryear by 20 minutes 23 seconds because of precession. [Lsidereus f. sidus sideris star]
tác giả
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