ASTR 1101 Chapter Notes - Chapter 4: Tropical Year, The Moons, Tidal Locking
15 Oct 2017
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Document Summary
Great circle any circle on the surface of a sphere whose center is at the center of the sphere (ie; earths equator. Meridian great circles passing through the north and south poles, each are perpendicular to the equator, crossing at right angles (the meridian specifies the east-west location of any point on earth) Longitude is the number of degrees of arc along the equator between your meridian and the prime meridian (greenwich, england at 0 ). how far east/west. One hour of right ascension = 15 degrees. In june, the northern hemisphere leans into the sun and is more directly and intensely illuminated, in december the southern hemisphere leans into the sun. in march and. Halfway between the solstices the sun is on the celestial equator (march and sept 21 vernal and autumnal equinoxes) Astronomers use the sidereal day rotation period of earth with respect to the stars.
