The quarter moon is when half of it shows.       
The Moon orbits the Earth once for every time it rotates on its axis.

The Moon orbits the Earth once for every time it rotates on its axis.

The amount of paint you would need to cover the entire surface of the moon. 

The amount of paint you would need to cover the entire surface of the moon. 

The Sun is 400 times larger than the Moon but is 400 times farther away from Earth, making them appear the same size.

The Sun is 400 times larger than the Moon but is 400 times farther away from Earth, making them appear the same size.

Happy 45th birthday to Moon Unit Zappa! Here’s a bunch of facts about the moon on the day she was born!

Happy 45th birthday to Moon Unit Zappa! Here’s a bunch of facts about the moon on the day she was born!

Neil Armstrong walked on the moon at 02:56:15 GMT on July 21.
This is how far the moon was from the Earth on that day.

Neil Armstrong walked on the moon at 02:56:15 GMT on July 21.

This is how far the moon was from the Earth on that day.

Today is not only Pi Day, but also Albert Einstein’s birthday!
133 years ago today he was born under a waning gibbous moon.

Today is not only Pi Day, but also Albert Einstein’s birthday!

133 years ago today he was born under a waning gibbous moon.