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Which planet has the longest day compared with its year?
Quick Answer
Venus has the longest day relative to its year. One rotation takes about 243 Earth days, while one orbit around the Sun takes about 225 Earth days.
The Full Story
Venus is unusual because it rotates very slowly and in the opposite direction to most planets. A full rotation relative to the stars takes about 243 Earth days, longer than its 225-day year. As a result, one day on Venus is longer than one year on Venus. This remarkable mismatch is one of the most famous oddities in planetary science.
Key Facts
1.Rotation: about 243 Earth days
2.Year: about 225 Earth days
3.A Venus day is longer than its year
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"The planet where a day is longer than a year!"
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