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.
Aphelion: The point in a planet's orbit furthest from the Sun. Sidereal Rotation: The time for a body to complete one rotation on its axis relative to the fixed stars such as our Sun. Earth's sidereal rotation is 23 hours, 57 minutes.