lecture13spring2009 - Astronomy100Dr.Rhodes Lecture Chapter...

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Astronomy 100 - Dr. Rhodes Lecture #13 - 2/13/2009
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Chapter 6: The Earth-Moon System Lunar Eclipses A lunar eclipse is an eclipse in which the Moon passes into the shadow of the Earth. The umbra is the portion of a shadow that receives no direct light from the light source. The penumbra is the portion of a shadow that receives direct light from only part of the light source. An eclipse season is a time of the year during which a solar or lunar eclipse is possible.
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Chapter 6: The Earth-Moon System Lunar Eclipses A lunar eclipse does not occur at each full Moon because the plane of revolution of the Moon is tilted 5° compared to the plane of the Earth’s revolution around the Sun. Only during the two or three eclipse seasons that occur each year are the Earth and Moon positioned so that the Moon will enter the Earth’s shadow during a full Moon.
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Chapter 6: The Earth-Moon System Lunar Eclipses Types of Lunar Eclipses A penumbral lunar eclipse is an eclipse of the Moon in which the Moon passes through the Earth’s penumbra, but does not pass through any part of its umbra. A penumbral eclipse occurred on Feb. 9, 2009. A total lunar eclipse is an eclipse of the Moon in which the Moon is completely in the umbra of the Earth’s shadow for a portion of the eclipse. Such an eclipse occurred on Feb. 22, 2008.
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Chapter 6: The Earth-Moon System Lunar Eclipses A partial lunar eclipse is an eclipse of the Moon in which only a portion of the Moon passes through the umbra of the Earth’s shadow.
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