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  • 1. SOLAR SYSTEM • 9 Planets – or 8????? • 99.86% mass of the SS is the sun • Due to the gravitational pull, the sun is the central object
  • 2. Gravity’s Influence on Orbits
  • 3. EARTH’S MOTIONS • Rotation – Earth rotates on it’s axis (23.5 degree tilt) • This causes day and night – 24 hours
  • 4. Seasons
    • The tilt of the earth causes the seasons
    • Because of the tilt to the sun’s position relative to the equator constantly changes.
  • 5. Tilt of the Earth
  • 6. Moon, Earth and Sun
    • • Scaled Model
    • • Sun 28’ in diameter
    • • Earth 8 cm in diameter
    • • Moon 2 cm in diameter
    • – If the globe is used to represent
    • Earth, the Moon would be about
    • 3” in diameter and would need to
    • be 30 feet away from the Earth.
  • 7. Can we make our solar system to scale?
    • http://www.exploratorium.edu/ronh/solar_system/
  • 8. Earth’s Moon
    • The moon rotates and revolves at the same rate = 27.3 days
    • • Same side of the moon always faces the Earth
  • 9.  
  • 10. Eclipse
    • • Occurs when the Earth or moon temporarily blocks the sunlight reaching the others.
  • 11. Solar Eclipse
  • 12. Solar Eclipse
    • Occurs when the moon moves directly between the sun and the Earth and casts a shadow on part of the Earth
    • Only involves .5% of the Earth’s surface
  • 13. Lunar Eclipse
  • 14. Lunar Eclipse
    • Occurs when the Earth passes between the sun and the moon and blocks sunlight from reaching the moon
  • 15.  
  • 16. Ocean Waves
    • • 2 types
    • Wind – height will depend on speed, distance and length of the wind blowing
    • Tides – gravitational force of the moon, sun and Earth
      • Tides are long waves that result in the periodic change in the surface level of the ocean.
      • Some areas experience 2 high tides and 2 low tides
  • 17.  
  • 18. Tides
    • Tidal Range is the difference between high and low tides.
    • The moon’s gravity exerts a strong pull on the Earth and causes high tides.
    • The rotation of the Earth causes the movement of the tides.
  • 19. Earth–Moon–Sun Positions and the Tides
  • 20. Tides
    • Spring Tides – Moon, Earth and Sun are lined up
      • High Tides Higher
      • Low Tides Lower
    • Neap Tides – Moon, Earth and Sun form right angles
      • High Tides Lower
      • Low Tides Higher
  • 21.  
  • 22.  
  • 23.