ASTR 152 Study Guide - Final Guide: Shadow Falls, Equinox, Circular Motion

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Speed of light designated by c ~ 300,000km/sec~ 186,000 miles/sec measured many times and always constant and. 1 ly= 1 light year ~ 6 x 10^12 (trillion) miles 63,270 au. 1 ly is the distance the light will travel in one full year ~ 365. 25 days rotation vs. revolution rotation: the spinning motion of a planet about it"s axis; revolution: the movement of an object around another. Scales: smallest to largest objects, nearest to most distant objects. Our closest neighbor is the moon 384,400km / 240,000mi. Chapter 2: sections 2. 1, 2. 2, 2. 3 and lectures: celestial sphere: celestial poles and equator: north celestial pole: the point directly over earth"s north pole; south celestial pole: the point directly over earth"s south pole. 20, summer solstice june 21, autumnal equinox september 22, winter solstice december 21 tropical/solar year: leap year: precession: this is a gradual wobble that changes the orientation of earth"s axis in space.

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