sidereal day
English Thesaurus
1. the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day (noun.time)
| hypernym | : | time unit, unit of time, |
| definition | : | a unit for measuring time periods (noun.time) |
| hypernym | : | sidereal time, |
| definition | : | measured by the diurnal motion of stars (noun.time) |
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