Calendars Through the Ages is a website sponsored by the Institute for Dynamic Educational Advancement (IDEA), a nonprofit organization committed to enhancing the public’s knowledge of science and culture. The site begins with an in-depth look at the astronomical basis of calendars. Significant historical calendars (such as the Roman and Mayan) and currently used international calendars (Jewish, Chinese and Islamic) are covered in Various Calendars. In the Do It Yourself section, students can make a calendar page by watching the moon everyday for a month and learning about the phases of the moon. To find out how their observations of the real sky match up with predictions, students can see a simulation of the whole month or a single day at a time.
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