Does the moon wax or wane as it changes from full moon to third quarter?
The moon wanes as it changes from full moon to third quarter. Less of the lighted side of the moon will be visible. • How are the first quarter and third quarter phases similar? How are they different? The first and third quarters both reveal half of the lighted side of the moon, but each one shows a different half. Because of the relative positions of the sun, Earth, and the moon, we see the right side of the moon lit during the first quarter and the left side of the moon lit during the third quarter.