Mathematics of the Calendar

Here is a calendar converter, concentrating on the Mayan calendars. For more general information about Mayan mathematics, click here. 

Here's some information about Babylonian mathematics.

This applet lets you see the path of the sun, at any location on earth, at any date!  This is very helpful for visualizing how the ancients could figure out when the solstices occurred.

Here's a drawing of a rather elaborate clepsydra.

We will eventually talk about the Julian day number for any given day in history.  This applet let's you compute this, and as a bonus, allows you to figure out how many days have elapsed between any two events of your choice!