Notes 1-17-08

Notes 1-17-08 - is the point on the celestial sphere that...

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Mercury has scarps Terms from first two chapters: daily and annual motions due to motions of Earth; Sun rises in east, sets in the west. Circumpolar star: goes around a pole Polaris: North Star, above the North Pole. Celestial Sphere: the globe of stars, has equator and poles, ascension and declination are coordinates like longitude and longitude. Line is ecliptic , goes through sun. Zodiac is a set of constellations that the sun travels through as Earth goes about the sun. Local coordinates are altitude (Alt.) (up) and azimuth (Az.) (N, S, E, W) within the position. Constellations are group of stars in their own regions Moon goes around moon in about thirty days. The zenith
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Unformatted text preview: is the point on the celestial sphere that lies directly above you, while the Nadir is directly below you. Horizon separates sky from ground. Eclipses: solar (moon is between earth and sun), lunar (earth passes between sun and the moon, creating shadow), annular (body in front does not completely cover the other, such as a ring of light) the tilt of the Earths axis creates seasons, also why sun is tilted in respect to the celestial equator. Eclipses dont occur monthly because the moons orbit is tipped with the Earths, so shadows may pass above or below....
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