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.
A mean sidereal day is 23 hours, 56 minutes, 4.0916 seconds (7001239344699000000â 23.9344699 hours or 6999997269580000000â 0.99726958 mean solar days), the time it takes Earth to make one rotation relative to the vernal equinox.