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.
In this time all the stars appear to revolve once around earth and return their starting positions. 25 days this is called a sidereal day, and is the amount of time that it takes the earth to make a full rotation on its axis and end up in the same position relative to the stars 30 mar 2015 why the rotation period of a planet is not the same as the length of its day, a result, it does not move around the sky in quite the same period of time that the stars do.