Astro Physics Question:

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If three bodies sun, earth and moon are situated in a
straight line, at the time of the moon entering the shadow
cone the moon will be totally obscured, thereby giving a
total lunar eclipse. If they are slightly out of line, only
a part of moon enters the umbrral cone and a partial lunar
eclipse occurs. This o curs at full moon when moon enters
that shadow of the earth, as cast by the earth.