Science Behind Calendars: Databases

Found in World History in Context, from The Journal of the American Oriental Society.

A reference article from World Eras, found in World History in Context database

An article about calendars from the Gale Encyclopedia of Science.

Found in World History in Context, from the Dictionary of the Middle Ages.

Information on calendars, featuring multiple kinds of content, from World History in Context.

From a book titled Religious Holidays and Calendars; found in the Credo Reference database. (Requires a Boston Public Library account, for which you can register free online - see Ms. Pronovost if you need help.)

This article provides a detailed explanation of the Mayan calendar and how it was created.