Learn more by clicking the Google or Facebook button below. Population Demographics for Tonasket, Washington in 2016 and 2017. Other Counties and Cities in Washington.
Sidereal Period versus Synodic Period. 1  Measuring the motion of the Moon around the Earth relative to the distant stars leads us to what is called the sidereal period. 2  Measuring the motion of the Moon around the Earth relative to the Sun leads us to what is called the synodic (pronounced si-nod-ik) period.
As discussed at Rotation Period and Day Length, the rotation period given above, which is the sidereal period of rotation of the planet (the time it takes to turn once around relative to the stars), differs by about one second from the length of its day (the time it takes the Sun to move once around the sky), due to Uranus' orbital motion during one rotation.