The Earth-Moon-Sun System

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The Earth-Moon-Sun System
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Rotation vs. Revolution

• Rotation the spinning of a body on its axis
• Revolution the motion of a body along a path
  around some point in space

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Precession

• The slight movement of Earths axis over a period
  of 26,000 years

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Seasons

• Caused because Earths axis is tilted 23.5
  degrees
• Summer N. Hemisphere is farthest from sun
• Winter N. Hemisphere is closest to sun

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Moon Shine

• The moon does not make its own light. It
  reflects sunlight.

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Waxing Waning

• Waxing Light side gets larger
• Waning Light side gets smaller

New Moon First Quarter Full Moon Third Quarter
New Moon
Animation
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Phases of the Moon
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Eclipses

• Lunar The shadow from Earth blocks the light
  from the sun. Lunar Moon goes dark.
• Solar The shadow from the Moon blocks the light
  from the sun. Solar Sun goes dark.

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Umbra Penumbra

• The Moon Earth cast 2 shadows. The darkest is
  the Umbra. The lighter is the Penumbra.

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The Origin of the Moon

• It is widely believed that the moon was formed
  when a Mars sized object smashed into the early
  Earth.

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The Lunar Surface

• Craters round depressions in the surface of the
  moon most were produced by the impact of
  rapidly moving debris

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• Highlands densely pitted, light-colored areas
  that cover most of the lunar surface

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• Maria dark, smooth surfaces originated when
  asteroids punctured the lunar surface, letting
  magma bleed out

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• Lunar Regolith a soil-like layer of gray debris
  covering the surface of the moon made up of
  rocks, glass beads, and fine lunar dust

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Tides

• Tides are the regular rise and fall of the ocean,
  caused by the moons gravitational pull on Earth.
• Spring Tide- sun, earth, moon in straight line
  and change between high and low tides are
  greatest
• Neap Tide- sun and moon are pulling at earth at
  right angles resulting in little change in low
  and high tides

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