ASTR 101 Lecture Notes - Lecture 3: The Moons, Angular Diameter, Orbital Period
13 Dec 2016
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Document Summary
For every 24 hours solar day, there is 1 sidereal day of 23 hours and 56 minutes; but it. Review of the celestial sphere - a big, imaginary dome around the earth that holds all the stars; has an equator, poles, and equinoxes, and is tilted 23. 5 degrees with the earth. The greeks called the planets wandering stars bc they move on the celestial sphere relative to the stars. Patterns of planet movement drove our initial understanding of astronomy. Solar day - the time between passages of the sun through your meridian; the day according to the sun. Sidereal day - the time between passages of a star through your meridian; the day according to another star all works out by the end of the year. There is a set motion of the moon in relation to the earth and sun; diagram on elms. New moon - sun/moon are near each other.
