Define Phases of the Moon.

Define Phases of the Moon.

Phase:

A phase of the Moon is the appearance and shape of the Moon as you see it at a particular time.

Phases of the Moon:

As the Moon orbits around the Earth, the half

of the Moon that faces the Sun will be lit up. 

The different shapes of the lit portion of the Moon that can be seen from Earth are known as phases of the Moon.