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Why is the length of a sidereal day and a solar day on Earth so similar?
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Why is the length of a sidereal day and a solar day on Earth so similar?

User Brian Scroggins
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Answer: Both Solar time and sidereal time make use of the regularity of Earth's rotation about its polar axis: solar time following the Sun while, roughly speaking, sidereal time follows the distant fixed stars on the celestial sphere.
User Mark Streatfield
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