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### 15 Cards in this Set

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 What is Polaris? Northern Star that does not move across the sky. Is stationary How do stars move? As a single group and appear to move from the Eastern horizon to the western horizon. Circumpolar stars they circle Polaris without ever dipping below the horizon. geocentric model The earth is the center of the universe and every thing revolves around the earth. heliocentric model the sun is the center of the universe and everything revolves around the sun. Nicholas Copernicus proposed the heliocentric model. Ptolemy Proposed the geocentric model retrograde motion when planets reverse direction. Mars, jupiter and Saturn will wander through the stars from west to east and occasionally switch direction and go from east to west. celestrial sphere dome of the sky that circles the earth on which all objects appear. The earth revolves in a __________ motion. counterclockwise motion The earth moves at a rate of ____ degrees per hour. 15 degrees rotation earth spinning on its axis from west to east at a rate of 15 degrees per hour for 24 hours. rovolution the earth takes 365 1/4 days to make one full completion on its orbit around the sun. Proof of rotation Foucault pendulum Coriolis effect Coriolis Effect a system of prevailing winds on Earth forms a series of symmetrical bands located north and south of the equator. It is a result of inertia acting on a rotating planet.