Why does the moon's appearance changing during the lunar cycle?

Answer 1

Because the moon is in orbit around the earth and the sun is shining on a certain point of the moon. We can see the changes from our perspective. This is similar to a shadow. Sometimes we can only see a sliver of the moon because the sun is almost directly facing the moon and we can't see that side.

Answer 2

First of all, the actual size of the moon is not what is changing. As the moon revolves around Earth, a varying amount of sunlight reflects off the moon. For example, no light is reflected from the moon during a new moon. During a new moon, all of the moon is illuminated by the sun.

Answer 3

The reason is because the moon's light comes from the reflection of light from the sun, so when the moon rotates around our Earth the angle the sun's light hits the moon changes, so sometimes the moon will reflect less some times more, and sometimes none, like a New Moon.

Answer 4

The phases of the moon are due to the reflection of sunlight.