Moon Madness

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Moon Madness

• Eclipses
• Phases

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Eclipses

• Only occur when the moon, earth and sun are in a
  straight line
• In a lunar eclipse the earth is between the sun
  and the moon
• In a solar eclipse the moon is between the sun
  and the earth

Solar Eclipse The moon is passing between the
earth and the sun
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Solar Eclipse
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Solar Eclipse (Total)

• The moon comes between the Earth and the sun
• What you see is the corona of the sun with the
  central disk blocked by the moon

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Time Lapse

• Eclipse can take several hours
• Sun moves in sky while moon moves across sun

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Baileys Beadscaused by craters on the edges of
the moon
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Types of Solar Eclipses

• Total Solar Eclipse occurs when the umbra of the
  Moon's shadow touches a region on the surface of
  the Earth.
• Partial Solar Eclipse occurs when the penumbra of
  the Moon's shadow passes over a region on the
  Earth's surface.
• Annular Solar Eclipse occurs when a region on the
  Earth's surface is in line with the umbra, but
  the distances are such that the tip of the umbra
  does not reach the Earth's surface.

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Orbital Motion in a Solar Eclipse
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Total eclipses of the sun are visible over only a
small portion of the Earth
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Total eclipses of the sun are visible over only a
small portion of the Earth
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Footprint of solar eclipse (moons shadow) on
Earth seen from space
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Transit of Venus

• Venus passes between the Earth and the sun
• Venus blocks part of the suns light (the moving
  black dot)

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Lunar Eclipse

• From time to time, the Moon (or a portion of it)
  enters the Earth's shadow in what is known as a
  lunar eclipse .The Moon is dimmed partially or
  almost completely, depending on whether it passes
  through the less dark part of the Earth's shadow,
  the penumbra , or the darker part, the umbra .

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Types of Lunar Eclipses
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View of Lunar Eclipse from the Moon
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Why we dont have eclipses all the time
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Why the moon looks red during an eclipse

• Sunlight is refracted and scattered by the
  Earths atmosphere, so even during totality a
  small amount of light hits the moon
• Its red because shorter wavelengths are more
  easily blocked by dust particles (also why
  sunsets are red)

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Phases of the Moon

• Waxing--more of the moon is visible
• Waning--less of the moon is visible

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Phases of the Moon

• Waxing--more of the moon is visible
• Waning--less of the moon is visible

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Rememberthe moons orbit is tipped out of plane
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Moon vs. Earth Orbits
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Phases of the Moon