How do the phases of the moon occur? In what order?

1 Answer

Moon is a sphere and 50% of its surface is always lit by Sun light.

Explanation:

Moon goes round the earth in 27 days and 8 hours. we see different portions of this 50%. When Sun and Moo n is on same side we do not see moon.When moon is opposite to Sun we see full disk
The inner moons show as it is always 50% lit. Outer moons show as we see it from Earth. Order is marked in the picture.illuminated.enter image source here
Picture credit Astronomy Ohio state ed.