Sky & Celestial Motion
Sky & Celestial Motion AY 101
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This 1 page One Day of Notes was uploaded by Alyssa Hendrixson on Tuesday January 20, 2015. The One Day of Notes belongs to AY 101 at University of Alabama - Tuscaloosa taught by Dean Martin Townsley in Winter2015. Since its upload, it has received 79 views. For similar materials see Introduction to Astronomy in Physics 2 at University of Alabama - Tuscaloosa.
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Date Created: 01/20/15
Astronomy 101 Lecture Notes FridayJanuary 9 2015 The Sky and Celestial Motion Celestial quotMotionquot 0 Two types of motion Each day 0 Sky objects rotate around the pole and move across the sky due to Earth39s rotation DaytoDay Solar system objects quotmovequot among background stars 0 Sun 0 Moon 0 Planets o The most obvious ceestia motion is not ceestia at all Stars do not move instead the earth rotates and planets move around the Sun Distant stars are the actual xed nonrotating reference Constellations 0 Patterns in the sky are created by projection o Stares are actually at very different distances 0 Local Sky 0 We use portions of spheres to indicate directions much like a compass on a map 0 This works because the stars are very distant much like the north pole is very distant from us when we are walking or driving around Orientation of our sky to stars 0 Orientation of our sky is determined by location of earth and the earth39s orientation 0 Stare beow horizon are quotnot upquot 0 North Celestial Pole Point around which stars appear to turn 0 Ceestia Equator Imaginary quotcirclequot indicating directions at right angle to celestial poe