An Unusual Sign in the Sky Bb

An Unusual Sign in the Sky Bb - An Unusual Sign in the Sky...

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An Unusual Sign in the Sky Lecture 4A – 9/27/10 Tail Gate Party #1 (a.k.a Exam #1 Review Session) during class on Oct.6 th . In each phase of the Moon, how much of the Moon is lit up by the Sun? Half the Moon is always lit by the Sun Except . . .
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What causes eclipses? The Earth and Moon cast shadows. When either passes through the other’s shadow, we have an eclipse . What causes eclipses? How can such a small object as the Moon block the Sun as seen from Earth? Why don’t solar eclipses occur with each new moon? 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.
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Summary: Two conditions must be met to have an eclipse: 1. It must be full moon (for a lunar eclipse) or new moon (for a solar eclipse). AND
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An Unusual Sign in the Sky Bb - An Unusual Sign in the Sky...

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