February 4, 2008

February 4, 2008 - February 4, 2008 What does perihelion...

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February 4, 2008 What does perihelion mean? o The point in a planet’s orbit when it is closest to the sun Eclipses o What causes eclipses? The earth and moon cast shadows When either passes through the other’s shadow, we have an eclipse o Lunar eclipses can only happen when there is a full moon can be penumbral, partial or total Total = the moon is completely covered and looks red Partial = part of the moon is in the umbra Penumbral = the moon is in the totally in penumbral Earth is 4 times the size of the moon Makes a big shadow Viewing a lunar eclipse is easier than solar eclipses o Solar eclipses Remarkable fact: sun and moon are the same angular size viewed from the earth Realistic scale is huge: the sun is 400 times bigger than the moon and 400 time farther away So in angular size they come out to be exactly the same size When can solar eclipses Solar eclipses occur only at new moon Solar eclipses can be partial, total or annular
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February 4, 2008 - February 4, 2008 What does perihelion...

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