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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.
- "MIRA". Jupiter. http://www.mira.org/fts0/planets/099/text/txt001x.htm. Retrieved 2005-5-24.