darthgently Posted Friday at 08:13 PM Share Posted Friday at 08:13 PM 1 hour ago, farmerben said: How many times does the Earth rotate in one year? I'm not sure if the answer is 364 or 366. If you had a planet that didn't rotate at all one day would equal one year. Venus is very interesting in this regard. 365.24, thus the leap years every 4 years dropping a day in February. Then some leap seconds thrown in on some schedule Quote Link to comment Share on other sites More sharing options...
tomf Posted Friday at 08:14 PM Share Posted Friday at 08:14 PM (edited) 2 hours ago, farmerben said: How many times does the Earth rotate in one year? I'm not sure if the answer is 364 or 366. If you had a planet that didn't rotate at all one day would equal one year. Venus is very interesting in this regard. It is 366.25. The sidereal day (compared to fixed stars) is 4 minutes shorter than the mean solar day. Your example of a non rotating planet would have a day the length of the year, but the sun would appear to be travelling in the wrong direction. Edited Friday at 08:17 PM by tomf More precision Quote Link to comment Share on other sites More sharing options...
darthgently Posted Friday at 09:11 PM Share Posted Friday at 09:11 PM 56 minutes ago, tomf said: It is 366.25. The sidereal day (compared to fixed stars) is 4 minutes shorter than the mean solar day. Your example of a non rotating planet would have a day the length of the year, but the sun would appear to be travelling in the wrong direction. 365.24 Quote Link to comment Share on other sites More sharing options...
farmerben Posted Friday at 10:40 PM Share Posted Friday at 10:40 PM Every day you do one rotation plus a little extra. The extras add up to a full rotation in one year. Quote Link to comment Share on other sites More sharing options...
darthgently Posted Friday at 11:07 PM Share Posted Friday at 11:07 PM 26 minutes ago, farmerben said: Every day you do one rotation plus a little extra. The extras add up to a full rotation in one year. Depends on reference frame I suppose. Works either way Quote Link to comment Share on other sites More sharing options...
Jacke Posted 58 minutes ago Share Posted 58 minutes ago On 1/24/2025 at 6:12 PM, farmerben said: How many times does the Earth rotate in one year? I'm not sure if the answer is 364 or 366. If you had a planet that didn't rotate at all one day would equal one year. Venus is very interesting in this regard. Depends on which "day" and which "year". https://en.wikipedia.org/wiki/Day https://en.wikipedia.org/wiki/Year If you mean mean solar day and Tropical year: > The mean tropical year is approximately 365 days, 5 hours, 48 minutes, 45 seconds, using the modern definition[13] (= 365.24219 d × 86400 s). The length of the tropical year varies a bit over thousands of years because the rate of axial precession is not constant. Quote Link to comment Share on other sites More sharing options...
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