Skip to main content

What causes the phases of the moon?

582,437 Views

8,598 Questions Answered

Best of Web

Let’s Begin…

What causes the phases of the moon? The common incorrect answer is the shadow of the Earth. The phases of the moon are actually just a result of our perception of the moon's half-illuminated surface. When the moon does pass through Earth's shadow the result is a lunar eclipse. This can be spectacular as the moon turns a deep shade of red.

Because of the lunar calendar, Thanksgiving Day in the United States and the first night of Hanukkah can fall just a day apart one year, but the next year it could be weeks later. Explain how this is possible.

Login to answer question

About TED-Ed Best of Web

TED-Ed Best of Web are exceptional, user-created lessons that are carefully selected by volunteer teachers and TED-Ed staff.

Meet The Creators

More from Out Of This World