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Earth and Space Science 13.3 The Effects of Planetary Motion Earth’s Rotation • The Earth rotates (spins) on an axis. • It takes 24 hours to do one rotation around its axis. • This motion causes most stars, sun and moon to appear to rise in the east and set in the west. • The Earth’s axis is an imaginary line that connects the North Pole to the South Pole. Earth’s Rotation Revolution • The planets revolve around the Sun in paths called orbits. • The orbits of most planets are nearly circular, with the Sun at the center of each orbit. • The period of time for one revolution around the sun is called one orbital period. Earth’s Revolution • It takes Earth one year (365 days) to travel and revolve in a circle around the sun. • This allows us to see different stars and constellations during different seasons. • The angle of the Earth’s axis and the Earth’s Revolution causes the different seasons. Earth’s Seasons • Earth rotates at a tilt of 23.5. • During our summer months, the northern hemisphere is tilted toward the Sun. The Earth’s Seasons Seasons • http://www.youtube.com/watch?v=WLRA8 7TKXLM&feature=related Seasons Video Homework • Read pg. 404 - 405 • Answer # 1 – 5 on pg. 405