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“sidereal periods”
The time it takes for a planet or satellite to make one complete circuit of its orbit (360°) relative to the stars: "The Earth's sidereal period, or sidereal year, is equal to 365.2564 mean solar days."
This entry is located in the following units:
hodo-, hod-, od-
(page 3)
sidero-, sider- (star)
(page 2)