Eclipses occur when one body passes in front
of another and the shadow of the first falls on
the second. If you stand in front of the TV
when your sister is trying to watch her favorite
program you are eclipsing her.
The ancient astrologers predicted eclipses by
looking for cycles. Eclipses have cyclic
properties. The ancients considered eclipses to be
very bad and they often tried hard to predict
them. Unfortunately if the king's astrologer got
the day wrong of an eclipse, he would probably
have his head cut off!
In modern times we have measured the orbits of
the planets around the sun and our moon around the
earth. We can predict the position of a planet
or a moon with great accuracy using algebra and
geometry. You can download programs from the
Internet that could predict the positions of the
earth and the moon relative to the sun and to
predict when the next eclipse will occur. --
You can find some free astronomy software here
but I don't think one that tells you about the
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