The moon connects you to everybody on the planet

The moon connects you to everybody on the planet, because, generally speaking, we all see the moon at the same phase. The moon’s orbit around Earth is regular and predictable. So the moon waxes and wanes in our sky in a way that’s about as satisfyingly regular and predictable as anything on Earth can be.
-http://earthsky.org/astronomy-essentials/getting-started-2