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In general terms a day for a planet is the time taken for the planet to make on rotation on its own axis.

Likewise a year for a planet is the time taken for the planet to make one orbit (rotation round) its primary star.

Where a planet is tidally locked to its primary, the day length and the year length will be the same, such that the planet keeps one face permanently towards it primary (like the Moon does to the Earth).

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14y ago

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