AST101H1 Lecture 3: AST101 Lecture- Sept 29
24 Oct 2015
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* programs: stellarium (sky from earth) & celestia (whole universe: light pollution prevents you from seeing more than a few dozen stars, from a dark location, you can see thousands of stars, to make sense of the sky, most cultures have broken the stars into constellations, constellations have no physical meaning the stars in space are not close together: all at different distances from the earth, the 99 western constellations completely cover the whole sky, so that we have names for every part of the sky. At sunrise/sunset, earth is rotating toward/away from the sun: why does the sun rise in the east? (cid:224) because earth is rotating toward the east, you can imagine that all the stars are attached to a transparent celestial sphere (a ball surrounding the earth) (cid:224) the star closest to the north celestial pole, is polaris (the north star)
