The moon is revolving around Earth, so sometimes the Moon is
between the Sun and Earth and Earth is between the moon and
sun.
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When the Earth is between the Moon and the Sun you get a full
moon, not a new Moon which occurs when the Moon is between the
Earth and the Sun. You could also get a Lunar eclipse.
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When the moon passes between the Sun and Earth there is a new
moon. In a special case where the Sun and Moon are aligned there is
an eclipse of the Sun (the moon blocking view of the Sun).