ASTR 1P01 Lecture Notes - Lecture 2: Ecliptic, Starset
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ASTR 1P01 Full Course Notes
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Constellations: groups of stars lying in same direction (only thing in common-they may not be close to each other in space) Polaris (north star), vega, deneb, altair, antares, spica: virgo, leo, cancer, libra, ophiuchus. 88 constellations, 44 known in ancient times, names from greek translated to latin. Night sky we see depends on our latitude, latitude of st. catharines: 43. 167 n. No matter where on earth, we are always upright and the sky is up. Altitude of object in sky is its angle above the horizon. Angular size/distance: angle b/n two directions from eye to two point in sky. B/c earth is: 1) rotating w to e (every 24 hr) & 2) revolving around sun (every 365. 25 days) There are 2 types of apparent star & sun motions. Describe motions using celestial sphere (cs) concept. It"s an imaginary sphere w/ radius which is bigger than radius of. Earth rotates w->e so we see the stars moving e->w.