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19 Cards in this Set
- Front
- Back
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What is the umbra?
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The region of total shadow.
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What is the penumbra?
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The region of partial shadow.
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What is a lunar eclipse?
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Occurs when the moon passes through Earth's shadow and grows dark.
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What is totality?
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The period when the moon is completely in shadow.
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If the moon is only partially under the umbra what kind of eclipse is the result?
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A partial lunar eclipse.
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Penumbral eclipses occur when...
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the moon passes through only the penumbral and never reaches the umbra.
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A solar eclipses occurs when...
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The moon moves between Earth and the sun.
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A total solar eclipse occurs when...
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the moon covers the disk of the sun completely.
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If the moon only covers part of the sun a....occurs?
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partial solar eclipse
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Small-angle formula
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angular diameter/206,265" = linear diameter/distance
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What is the path of totality?
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The path swept out by the umbral spot during a solar eclipse.
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Perigee
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The moon's closest point to the Earth.
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Apogee
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The moon's most distant point from Earth.
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An annular eclipse occurs when...
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The moon's angular diameter is too small, causing a ring of light to be visible around the disk of the moon.
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The sun's faint atmosphere that can be seen during a solar eclipse is called...
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Chromosphere and corona
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The diamond ring effect occurs when...
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The small portion of the photosphere peeking from behind the moon does not completely drown out the fainter corona.
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Eclipse Season: Solar eclipses
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Eclipse season lasts 32 days, any new moon in this period will produce a solar eclipse.
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Eclipse Season: Lunar eclipses
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Eclipse season lasts 22 days, any full moon during this period will encounter Earth's shadow and be eclipsed.
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How long is the Saros cycle?
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18 years 11 & 1/3 days.
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