How long is a day on the different planets?
Quick Answer
A planet’s day is its rotation period: Jupiter spins in about 10 hours, Earth in 24 hours, and Venus takes about 243 Earth days to rotate once.
The Full Story
A planet’s day is measured by how long it takes to spin once on its axis, and the results vary wildly across the Solar System. Jupiter rotates the fastest, finishing a turn in about 9 hours 56 minutes, while Earth takes nearly 24 hours. Venus is especially unusual because it rotates very slowly and in the opposite direction to most planets, taking about 243 Earth days for one rotation. Mars has a day close to Earth’s at about 24 hours 37 minutes, which is why Mars mission planners often use it for scheduling. Day length affects climate, weather, and the pace of life on a planet.
Key Facts
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