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Calendars Through the Ages
Authoritative site on a variety of the world's calendars.
Grade Level: 3-5, 6-8

The Institute for Dynamic Educational Advancement (IDEA) provides information on how the Gregorian (Christian) calendar was developed as well as the calendars of other cultures.
The site has a simple yet elegant design with a top navigation bar that leads to the main sections of the site. Internal pages have a left side menu for movement within the section.

Calendars Through the Ages gives visitors an overview of how calendars of various cultures were developed. It covers calendars that are still in use, such as Chinese, Christian, Indian, Islamic, and Jewish calendars, and those not in use, such as Ancient, French, Future, Mayan, and Roman calendars. The section “Years and Months” explains the astronomical basis and the history of calendars and offers definitions and a chronology of the international acceptance of the Gregorian calendar. The origins of the week and the names of the days are explored in the section “Our Week,” and the site also offers a timeline of interesting calendar facts. Included is a list of suggested books for further reading.


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