Thread: If a world was three times as large as Earth, how long would a day be?
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Old 12-18-2010, 06:59 PM   #5
ardeegee
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This chart gives you (amongst much more information) the mass and day length of all planets in this solar system related to that of Earth-- you'll see that there isn't much correlation.

http://nssdc.gsfc.nasa.gov/planetary...ble_ratio.html

And, remember, that is just the day length now. That changes over time-- it was much faster for all planets early in the solar system's history, and will continue to slow down with time. This PDF has a chart with estimated day lengths over Earth's history (on page 3):

http://www.ptep-online.com/index_fil...9/PP-16-02.PDF
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