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Understanding Earth's Motions: Rotations, Revolutions, and Celestial Phenomena

Learn about Earth's rotation & revolution, the movements of the sun, moon, and stars, the changing constellations, and evidence for these motions. Discover how to calculate Earth's rotation rate, find Polaris, and understand the evidence for rotation and revolution.

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Understanding Earth's Motions: Rotations, Revolutions, and Celestial Phenomena

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  1. Earth Motions Astronomy Page 8 ©Mark Place, 2009-2010 www.LearnEarthScience.com

  2. Earth's Motions How long is one rotation of Earth? One day How long is one revolution of Earth? One year

  3. Rising and Setting of the Sun Rising and Setting of the Moon Rotation Movement of Stars through the sky The Seasons Changing Constellations Revolution

  4. How do you calculate Earth's rate of rotation? One rotation = 360° Time for one rotation = 24 hours 360° ÷ 24 = 15°/hr

  5. How many degrees did the stars move from diagram 1 to diagram 2? 30° (2 hours x 15°)

  6. It’s the only one that didn’t move How can you find Polaris?

  7. Northern Because Polaris can only been seen in the North What hemisphere must you be in? Why?

  8. What direction must you be looking? North

  9. What direction do the stars appear to move?

  10. What causes the stars appear to move?

  11. Evidence for Rotation Foucault Pendulum Coriolis Effect

  12. Evidence for Revolution Changing Constellations Parallax

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