Explaining the lunar phases in simple and easy words
I don't exactly get how the moon changes shape. Isn't it supposed to be a sphere the whole time?
It is always a sphere. However, it orbits Earth just as Earth orbits the sun. The shadow of the moon is what makes it seem to change shape.
When the moon is between the Earth and sun, the side of the moon facing us (always the same side), gets no sunlight, and that is called a "new moon." When the moon is on the other side of Earth, the side facing us will get enough light that it looks like an actual sphere, and is called a "full moon."
Rarely, during one of these phases, the moon and Earth will be directly between one another and the sun, causing an eclipse. This doesn't happen all the time because the moon's orbit is tilted.
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