Question

why do we observe phases of the moon

Answer 1

The half of the Moon that points toward the Sun looks bright because it is lit by sunlight. The Moon appears to change shape because we see different amounts of the lit part as the Moon orbits Earth. ... The moon orbits the Earth.

Answer 2

our earth keeps on revolving and it also rotates. the phases of the moon depends upon the place of the earth from where we see.as it keeps on rotating we can't see the full moon always.

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