Sidereal day

Sidereal day

The stellar day or “sidereal day” is shorter than the solar day. At time 1, the Sun and a certain distant star are both overheads. At time 2, the planet has rotated 360° and the distant star is overhead again but the Sun is not (1->2 = one stellar day). It is not until a little later, at time 3, that the Sun is overhead again (1->3 = one solar day). Image: Wikipedia

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