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.
1) Sideral = stars; solar = Sol/The Sun. Mercuryâs sidereal day/rotation period is indeed 58.646 Earth days. This means that it takes 58.646 Earth days for background stars (NOT the Sun) to rise, set, and then rise again.