> Facts & Reference
21st Century Calendar
200 year calendar which you can print out and use! Find the day of the week you were born or figure out days and dates for any year between 1900 and 2100.
A Walk Through Time
Learn about the evolution of time measurement from the calendars used in ancient history, through early clocks, up to the atomic clocks we use today.
Learn how the Aztecs measured time.
Calendars Through the Ages
Learn about how the week and year came to be, plus check out calendars from different cultures, including the French, Chinese, and Mayan.
Calendars: Counting the Days
Learn all about ancient calendars, the Gregorian calendar of today, and the calendar of the future which might include a 13th month!
It's All About Time
Learn interesting history about time and how we mark it. Includes info on calendars, Daylight Saving Time, clocks, and when the third Millennium begins.
Maya Astronomy Page
Learn about Mayan mathematics as well as their calendar, writing system, and understanding of astronomy.
Kidproj presents a list of holidays around the world by their country and month.
USNO Frequently Asked Questions
Get official answers for your questions about the sun and moon, time, calendars, the history of holidays, and other topics related to astronomy. From the U.S. Naval Observatory.
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