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 Sidereal day : Sideral day 

An apparent sidereal day is the time it takes for the earth to turn 360 degrees in its rotation; more precisely, is the time it takes the vernal equinox to make two successive upper meridian transits. This is slightly shorter than a solar day; there are 366.2564 sidereal days in a year, but 365.2564 solar days, resulting in a sidereal day of 86,164.10 s.

Midnight, in sidereal time, is when the vernal equinox crosses the upper meridian.

A mean sidereal day is reckoned, not from the actual transit, but from the transit of the mean vernal equinox (see: mean sun).

See also: sidereal month, sidereal time, time

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