The period of revolution of one body around another with respect to the distant stars.
- Each year is still equivalent to the sidereal period of the Earth, one revolution around the Sun.
- He discovered that in 7 cycles of 12 years, Jupiter had completed seven and one twelfth orbits, giving its sidereal period as 11.859 years (accurate to within one part in 4000).
- The names of our weekdays, and the fact that there are seven of them, probably reflect astrological assumptions concerning the significance of the sidereal periods of the planets.
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