Question

What is Sidereal day? ​

Answer 1

Answer:

The Sidereal Day is 4 minutes shorter than the Mean Solar Day, because the rotation of the Earth on its axis, and the orbiting of the Earth around the Sun, are both counterclockwise, as viewed from above (or north of) the Ecliptic Plane. See planetary retrograde motion for an example of the opposite situation.

Answer 2

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☞A sidereal day is the time it takes for the Earth to rotate about its axis so that the distant stars appear in the same position in the sky. ... The sidereal day is the time it takes for the Earth to complete one rotation about its axis with respect to the 'fixed' stars.

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