"Venus, all you need to do is identify some feature or mark and note the time it takes to reappear, as it rotates around the globe. Beginning in 1666, Cassini made the first attempt to do this. He found a rotation period of 23 hours and 21 minutes. In 1789, Schroder refined this estimate to 23 hours, 21 minutes, and 19 seconds."
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Venus
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