A page from the "Calendars" exhibit...

About this exhibit


Calendars Through the Ages is one of several exhibits in the WebExhibits online museum, all of which promote discovery through multidisciplinary approaches that support all learning styles. WebExhibits is a public service of the Institute for Dynamic Educational Advancement (IDEA).

The "node view” of Calendars Through the Ages was created using SpicyNodes, a free, intuitive tool that you can use to easily make your own interactive and engaging nodemaps.

Are you a student?

Writing a paper or doing research? Here’s how to cite this exhibit in your paper. Also see the recommended books if you need more sources.

Are you an educator?

Consult the do-it-yourself moon calendar for a project to do with students. If you are interested in interactive education, IDEA’s Journal of Interaction Recipes may be useful.

Links & copies

We invite you to link to any page within this exhibit. You can also copy or display this exhibit for noncommercial purposes, if you clearly credit WebExhibits. Legal details.


Thanks to individual donations and corporate sponsorships, IDEA is able to maintain and update WebExhibits, as well as develop new exhibits on timely topics. We welcome your contributions, both large and small.

Join the community

Help grow this exhibit! WebExhibits wants to publish your insights into the history of calendars covered in this exhibit, as well as incorporate new facets of the evolution of calendars. Share your expertise, or send us your corrections, suggestions and feedback via or our feedback form.

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Curated by Michael Douma. Edited by Sally Smith. For more information, see the suggested books.


Calendars Through the Ages is funded in part by the U.S. Department of Commerce, National Institute for Standards and Technology (NIST), Time and Frequency Division, as a complement to www.time.gov. WebExhibits welcomes corporate sponsorships, and can assist you in identifying exhibits that are aligned with your community relations and marketing goals.