| NOUN | time | sidereal time | measured by the diurnal motion of stars |
|---|
| Meaning | Measured by the diurnal motion of stars. | |
|---|---|---|
| Narrower | sidereal day, day | The time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day |
| sidereal hour | 1/24 of a sidereal day | |
| sidereal month | Period between successive conjunctions with a star, 27.322 days | |
| sidereal year | The time for the earth to make one complete revolution around the sun, relative to the fixed stars | |
| Broader | cosmic time | The time covered by the physical formation and development of the universe |
| Catalan | temps sideri | |
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