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In order to predict a lunar eclipse, you need to know the geocentric direction of the moon and the geocentric direction of Earth's shadow from the sun. If the angular difference between the center of the moon's disk and the center of Earth's shadow is small enough, then there will be a lunar eclipse. Otherwise, not. Step 1. Choose a calendar date for your observation. Y = the number of the ...
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Published: 1 year, 5 months ago (Thu, 14 Feb 2008 07:38:27 PST); 6064 bytes
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