Geometry of Solar Eclipses

Geometry of Solar Eclipses - not reach the Earth's surface....

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Geometry of Solar Eclipses The geometry associated with solar eclipses is illustrated in the following figure (which, like most figures in this and the next section, is illustrative and not to scale). Geometry of solar eclipses The shadow cast by the Moon can be divided by geometry into the completely shadowed umbra and the partially shadowed penumbra . Types of Solar Eclipses The preceding figure allows three general classes of solar eclipses (as observed from any particular point on the Earth) to be defined: 1. Total Solar Eclipses occur when the umbra of the Moon's shadow touches a region on the surface of the Earth. 2. Partial Solar Eclipses occur when the penumbra of the Moon's shadow passes over a region on the Earth's surface. 3. Annular Solar Eclipses occur 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
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Unformatted text preview: not reach the Earth's surface. As illustrated in the figure, in a total eclipse the surface of the Sun is completely blocked by the Moon, in a partial eclipse it is only partially blocked, and in an annular eclipse the eclipse is partial, but such that the apparent diameter of the Moon can be seen completely against the (larger) apparent diameter of the Sun. A given solar eclipse may be all three of the above for different observers. For example, in the path of totality (the track of the umbra on the Earth's surface) the eclipse will be total, in a band on either side of the path of totality the shadow cast by the penumbra leads to a partial eclipse, and in some eclipses the path of totality extends into a path associated with an annular eclipse because for that part of the path the umbra does not reach the Earth's surface....
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This note was uploaded on 12/04/2011 for the course ANT ANT2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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