Chapter_2.part3 - 9/4 Eclipses = Interference + Shadows...

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Eclipses = Interference + Shadows 9/4
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What causes eclipses? The Earth and Moon cast shadows. (shadows) When Moon or Earth passes through the other’s shadow, we have an eclipse. (interference)
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Solar Eclipse Eclipses = Interference Penumbra: Lighter, outer region of the shadow Umbra : Dark, central region of the shadow
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When can SOLAR eclipses occur? Solar eclipses can occur only at new moon . Solar eclipses can be partial , total, or annular . 9/8
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Lunar Eclipse Eclipse = Interference
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When can LUNAR eclipses occur? Lunar eclipses can occur only at full moon . Lunar eclipses can be penumbral , partial , or total .
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Why don’t we have an eclipse at every new and full moon? The Moon’s orbit is tilted 5° to ecliptic plane… So we have about two eclipse seasons each year, with a lunar eclipse at full moon and solar eclipse at new moon. To have an eclipse:
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This note was uploaded on 09/08/2010 for the course ASTR 101 at San Jose State University .

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Chapter_2.part3 - 9/4 Eclipses = Interference + Shadows...

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