Rotation & Revolution

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Rotation & Revolution

  1. 1. EARTH’S MOVEMENT Rotation & Revolution
  2. 2. Earth’s Rotation <ul><li>Rotation – earth spins on its axis (counter-clockwise) </li></ul><ul><li>Axis – Imaginary line through the middle of earth </li></ul><ul><li>Earth spins or rotates on its axis one time every 24 hours (15° per hour) </li></ul><ul><ul><li>Evidence – Day & Night </li></ul></ul>
  3. 3. Earth’s Tilted Axis <ul><li>Tilt – to the side, or not straight </li></ul><ul><ul><li>Earth’s axis is tilted 23.5° </li></ul></ul><ul><li>Polaris – Earth’s axis always points to Polaris (The North Star) </li></ul>
  4. 4. Equator & Hemispheres <ul><li>Hemisphere – half of the earth </li></ul><ul><li>Earth is divided into 2 hemispheres (Northern and Southern) by the Equator </li></ul>
  5. 5. Time Zones <ul><li>The world is broken up into 24 time zones divided by the lines of Longitude </li></ul>
  6. 6. Earth’s Revolution <ul><li>Revolution – earth’s movement around the Sun </li></ul><ul><li>Earth orbits/revolves (goes around) the Sun one time every 365 days (1 year). </li></ul><ul><li>The shape of earth’s orbit is an ellipse </li></ul><ul><ul><ul><li>Evidence – Earth’s seasons & movement of the stars </li></ul></ul></ul>

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