Top 4 keys to understanding moon phases

How can you understand what causes the various phases of the moon? Four tips, here.

What is a new moon?

New moons generally can't be seen. They cross the sky with the sun during the day. The moon's shadow side is toward Earth.

What is a waning gibbous moon?

The waning gibbous moon falls between full and last quarter. See it best from late night through early morning.

Moon phases 2021 in text format

Read a list of the phases of the moon for all of 2021.

Quarter moon or a half moon?

Half the moon always faces us. And half the moon is always lit by the sun. But, in the language of astronomers, there are no 'half moons.'