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Sidereal day
- the interval between two successive passages of the vernal equinox over the meridian, being about four minutes shorter than a mean solar day.
A sidereal day is approximately 23 hours, 56 minutes, 4.091 seconds. That corresponds to the time it takes the Earth to complete one rotation relative to the vernal equinox. Since the vernal equinox precesses (every 26,000 years) in a westward direction relative to the fixed stars, the sidereal day is some 0.008 seconds shorter than the Earth's period of rotation relative to the fixed stars. The longer true sidereal period is called a stellar day.
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