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. Watch for it to rise late at night. Or see it in the west in the 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.'