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 sidereal period is the orbital period of one object about another measured with respect to the stars (quoted from Discovering the Universe 5th Edition by Neil Comins and W â¦ illiam Kaufmann III). Basically it is how long a celestial object takes to go around another with respect to the stars.