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What natural processes can cause a sidereal day to be significantly longer than a sidereal year?
The classic example here is Venus, with a sidereal day of 245 Earth days and a sidereal year of 224.7 Earth days - clearly less than its sidereal day. I wrote an answer related to this on Astronomy...
Answer
#1: Attribution notice removed
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System
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2020-06-01T14:13:49Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/39751 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/