Eclipses 5/19/11

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Eclipses 5/19/11

• 20-2c pgs. 552-553
• IN Which two planets do not have moons? Why not?

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Eclipse occurs when the shadow of one
celestial body falls on another.
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• Lunar eclipse - happens when the Moon passes
  through the shadow of the Earth.

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Lunar Eclipses

• During a lunar eclipse the moon can look red.
• Lunar eclipses can occur only at full moon.
• Everybody on the night side of the Earth can see
  the lunar eclipse.

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Lunar Eclipse
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• Solar eclipse - happens when the Moon comes
  between the Earth and the sun.

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Solar eclipses

• Solar eclipses can occur only at new moon.
• Only people in the shadow can see the eclipse.

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Solar Eclipse
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Solar Eclipse from the Moon
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Why dont we see solar and lunar eclipses every
month?
Ecliptic plane
Moons orbital plane
Moon
Sun
Earth
The Moons orbit around Earth is inclined about 5
degrees to Earths plane of orbit around the Sun.
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• OUT During which moon phase does a solar eclipse
  occur?