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The gravity of the Sun has slowed the rotation of Mercury, so it takes almost 59 Earth days to spin once on its axis (58.646 days).

At the same time, the relatively brief orbital period (Mercury year) is only 88 days long, even further reducing the apparent motion of the Sun as seen from the planet. A "solar day" (sunrise to sunrise) on Mercury lasts 176 Earth days, or twice as long as its year!

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13y ago

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