- Types:
- show 11 types...
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sidereal time
measured by the diurnal motion of stars
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solstice
either of the two times of the year when the sun is at its greatest distance from the celestial equator
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equinox
either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length
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day, sidereal day
the time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day
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sidereal year
the time for the earth to make one complete revolution around the sun, relative to the fixed stars
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sidereal hour
1/24 of a sidereal day
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sidereal month
period between successive conjunctions with a star, 27.322 days
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June 21, midsummer, summer solstice
June 21, when the sun is at its northernmost point
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winter solstice
December 22, when the sun is at its southernmost point
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March equinox, spring equinox, vernal equinox
March 21
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September equinox, autumnal equinox, fall equinox
September 22
