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Eclipse of the moon...

 

4813b

circles in 4813a filled, 2609 , 4813b , 2001 , denotes an eclipse of the moon in astronomy. This phenomenon means that the opposition of the sun and the moon (i.e. the full moon) is exact also in declination. Then the surface of the moon is totally in the shadow of the earth. Usually, when the moon is full, it moves either slightly above or below the earth's orbit around the sun and therefore is not shadowed by the earth. A 4813b occurs when that longitude in the ecliptic where the moon is in exact opposition to the sun, is also one of the moon's nodes, 3806a or 3805a

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