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.
Synodic period relates to an object's position relative to the sun. So the cycle which goes from full moon to full moon is a synodic cycle. A sidereal period is sometimes called a 'star day'. It relates to an object's position relative to the distant stars.