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Planetary Science
Planet Venus

Which planet's day is longer than Earth's years?


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June 13, 2007 12:16PM

There are no known planets with rotation periods longer than an Earth year. Venus has the longest rotation period in our solar system, taking 243 Earth days to complete one Venusian "day". Strangely, this is longer than one Venusian "year" or complete orbit around the Sun, which is 225 days, meaning Venus celebrates "New Year" more often than sunrise!