French
DeutschRotation period - Simple English Wikipedia, the free encyclopedia
In astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis relative to the background stars. For the Earth this is a sidereal day. It is different from a solar day, which is measured by the passage of the Sun across the local meridian.
All celestial objects spin.[1][2][3] The rotation period differs according to whether the body in question is solid or fluid (gaseous). A solid object has one value, but a fluid object such as a star spins differently at the poles compared to the equator (Sun: about 25 days at the equator and about 35 days near the poles).[4][5]
Related pages
[change | change source]Other websites
[change | change source]- "MIRA". Jupiter. Retrieved 2005-05-24.
References
[change | change source]- ↑ Why and how do planets rotate?. Scientific American. 14 April 2003.
- ↑ Ethan Siegel 2019. This is why black holes must spin at almost the speed of light. Forbes.
- ↑ Robert Walty 2019. It is said that most black holes likely have spin. What exactly is it that spins?. astronomy.com.
- ↑ Zell, Holly 2015. Solar rotation varies by latitude. NASA.[1]
- ↑ Beck J. 2000. A comparison of differential rotation measurements. Solar Physics. 191: 47–70. Bibcode:2000SoPh..191...47B.doi:10.1023/A:1005226402796
