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Mark Fisher
1999-2008
Sidereal Day
Essentially, the time taken by a body to rotate once on its axis, measured relative to the stars. Strictly speaking, the term 'day' only applies to the Earth making this rotation, but the term is often loosely used when referring to other planets, moons and so on. Earth's sidereal day, incidentally, lasts 23 hours, 56 minutes and 4 seconds.
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