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What is a sidereal day?

What is a sidereal day? Here are some definitions.

Noun
  1. (astronomy) one day of sidereal time; the time in which Earth rotates once around its axis, relative to the point of the vernal equinox (about 23 hours, 56 minutes, 4 seconds)
  2. (astronomy) rotational period of Earth; the time in which Earth rotates around its axis 360 degrees
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