The Science of Lunar Calendars

In honor of Lunar New Year, a quick round up of interesting sites talking about the science and math behind early lunar calendars:

A basic intro from today's edition of the Christian Science Monitor, on why Chinese New Year is not on January 1.

An astronomy perspective on the development of calendars.

A lunar calendar find in Scotland.

The oldest lunar calendar found so far.

A history of the Chinese calendar, including both cultural and scientific information.