sidereal time

sidereal time

The sidereal day is the time of one complete revolution of the Earth relative to the first point of Aries, or the spring equinox. This is not quite the same time as one revolution relative to the stars, since the first point of Aries moves very slowly around the ecliptic, owing to precession; but the difference is only 0. 008 seconds. The length of the sidereal day is 23 hours 56 minutes 4. 09 seconds, recorded as 24 'hours' on a sidereal clock.

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Industry/Domain: Chronometry
Category: Clock
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