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Interesting question. What makes a day on Io ? Is it having the sun in the sky, or having Jupiter in the sky ? And would that choice make a difference in the best answer ? I'll take the easy way out: Io's rotation on its axis is in sync with its period of revolution around Jupiter. Both are = 1.769 earth days = approx. 42hours 27.5minutes

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14y ago
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Q: How many hours is there in a day in Io?
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