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Unformatted text preview: Celestial Sphere Reference Points Observer based - different for every observer horizon - where the sky meets the sea zenith - point directly overhead (easy to measure) meridian - great circle (i.e. straight line) connecting north and the zenith Sky based - same for every observer Celestial Pole (in Berkeley - North CP) - the point on the sky around which all stars turn (Does Earth rotate or does the sky? - How do you know?) Celestial Equator - the great circle that is 90 O from the celestial poles Right Ascension (RA) - great circles through the north and south celestial poles (like longitude on the Earth) Declination (Dec) - lines (but not straight ones) at regular intervals perpendicular to lines of RA (like latitude on the Earth) Constellations...
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- Spring '06