2 - The Sky, Moon, Eclipses and Tides

2 - The Sky, Moon, Eclipses and Tides - left from last...

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left from last lecture : structure of stars summary of mass scales in astrophysics search for other planetary systems (exoplanets) Today : Our local viewpoint appearance of sky and Fnding *’s, planets, galaxies To do : signup for sections by 5 pm ±riday meeting in sections
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Mass scales – solar system w/ planets orbiting sun (1 M sun ) sun orbits in the Galaxy (Milky Way -- 10 11 M sun ) MW in cluster of ~30 gal. (Local Group -- 10 12 M sun ) Local Group part of Virgo supercluster (5x10 13 M sun ) galaxy clusters up to 3x10 14 M sun ( 1 M SUN = 2x10 33 gr , M earth = 6x10 27 gr)
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2 major motions: earth rotation (24 hr) and orbital (365.25 days , 1yr) (also moon’s orbit -- 27 days) all motions ccw (viewed from N.P.) N.P. 23.5 o *s are very distant => project *s on to spherical surface w/ earth at center. ecliptic moon’s orbit equatorial plane 5 o 23.5 o Viewing the sky -- understand, don’t memorize !!
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Time : solar -- 1 day = time between transits of sun
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2 - The Sky, Moon, Eclipses and Tides - left from last...

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