Definitions | sidereal year |
| noun
- The orbital period of the Earth; a measure of the time it takes for the Sun to return to the same position with respect to the stars of the celestial sphere. A sidereal year equals 365.25636042 mean solar days, or 20 minutes and 24 seconds longer than the tropical year.
Translations: - French: (t, fr, année sidérale, f)
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