Have any info on lunar phases?

Question

I need any general information about lunar phases. But the more detailed, the better. Also, I have a chart with a moon that shows the phases and it has numbers on it next to the pictures of the phases in a circle like this: GOING LEFT: 0 (top of circle), 23, 22, 21, 20, 19, 18, and so until 1 and then next to the one is the 0.

This is for a report I'm doing.

Answer 1

Here is something simple to get you started:
http://aa.usno.navy.mil/faq/docs/moon_phases.html