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Lunar cycle and tides

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Transcript

  • 1. SPACE The Lunar Cycle and Tides
  • 2. The Moon
    • For centuries, human beings have been fascinated by the moon…by the way it changes shape, causes our tides, and creates eclipses.
    • A cow has jumed over the moon…and an old man lives on it.
    • Humans have worshipped the moon, feared the moon, and created numerous superstitions about the moon.
    • It has even been known to alter human behaviour (people have been known to go “looney”)
  • 3.
    • While these stories are interesting, they don’t really help us understand what happens.
    • We only see the Moon because sunlight reflects back to us from its surface.
    • The moon looks like it’s changing shape all the time (moon phases), but that’s just what it looks like to us on Earth.
  • 4.
    • In reality , from space, the moon always looks the same , half light, and half dark.
    • This is because half of the moon is always facing the sun and the other half is in shadow.
    • But for us on Earth, it looks like it’s changing shape because the moon is orbiting around us.
    • Animation
  • 5.
    • It takes 29.5 days for the moon to make one complete lunar cycle (or one month)…
    • … and the only time we get an accurate view of the moon is at the half moon each month.
    • Animation
  • 6. Use the smart board pen to colour in the phases of the moon as they appear to us on Earth, (#1-8) or colour in the phases on your own worksheet.
  • 7.
    • One last animation, just to be sure.
  • 8. Tides
    • The moon also affects the tides in our oceans as it revolves around the earth.
    • The gravitational pull between the Earth and the moon and the Earth and the sun, create a bulge of water every day.
    • When the gravitational forces of the moon and sun combine to pull in the same direction we get our biggest tides (spring tides)…
    • … and we get our lowest tides (neap tides) when these forces pull in different directions .