PHYS-UA 11 Study Guide - Midterm Guide: Celestial Equator, Angular Diameter, Oxes
4 Nov 2016
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Meridian: line connecting ends of horizon (n to s), passing through zenith. Horizon: all points 90o from zenith: constellations depend on time of year and latitude, depend on latitude (your position determines which constellations lie above the horizon), depends on time of year. Earth"s orbit around the sun changes apparent position of the sun amongst the stars: stars rise and set. Earth rotates from west to east, so stars appear to circle from east to west: stars near the north celestial hemisphere are circumpolar (i. e) never set. From nyc, you can never see stars near the south celestial hemisphere. Orion is overhead at midnight in december, but is setting in. They"ll be a little closer to the western horizon each day: earth"s orbit around the sun: In 24 hours, earth spins more than 360o between successive meridian crossings by the sun, because the. Earth spins on its axis while it moves around the sun: the celestial sphere:
