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It takes about 59 Earth days (58.66 days) for Mercury to make one rotation.

However, its "day" is extended due to the extremely short orbital period of 88 Earth days : a "sunrise to sunrise" solar day is 176 Earth days long (2 Mercury years).

This is the source of the saying "On Mercury, a day is twice as long as a year."

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Tiara Lebsack

Lvl 13
2y ago

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