sidereal month
English Thesaurus
1. period between successive conjunctions with a star, 27.322 days (noun.time)
| hypernym | : | month, |
| definition | : | a time unit of approximately 30 days (noun.time) |
| hypernym | : | sidereal time, |
| definition | : | measured by the diurnal motion of stars (noun.time) |
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