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.
Also called sidereal year. a division of time equal to the solar year plus 20 minutes, the time it takes the earth to complete one revolution around the sun. 5. the time in which any planet completes a revolution around the sun. 6. a full round of the seasons. 7. a period out of every 12 months devoted to a certain pursuit, activity, or the like: the academic year. 8. years, a. age: a person of her years.