What is a sidereal day?

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Renewable Energy Practice Test: Solar Day Length — practice the complete quiz, review flashcards, or try a random question.

On Earth, a solar day is around 24 hours. However, Earth's orbit is elliptical, meaning it's not a perfect circle. That means some solar days on Earth are a few minutes longer than 24 hours and some are a few minutes shorter.

Related: Renewable Energy Practice Test: Solar Time (Locał Apparent Time) 


What is a sidereal day?