Scholastic
Scholastic Internet Field Trip: Calendars & Time Measure
Study the math and history involved in the development of the 12 month calendar. There are lots of links to informative time and calendar websites to assist you.
Khan Academy
Khan Academy: Common Questions About Dates
Our calendar is called the Gregorian calendar and was instituted by Pope Gregory XIII in 1582. There are many other calendars. Learn about these calendars and the meanings of B.C.E and C.E.
Institute for Dynamic Educational Advancement
Web Exhibit: The Islamic Calendar
This website gives very detailed information about all aspects of the Islamic calendar.
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Web Exhibit: The Christian (Julian) Calendar
This website gives very detailed information about all aspects of the Christian (Julian) calendar.
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Web Exhibit: The Indian Calendar
This website gives very detailed information about all aspects of the Indian calendar.
Wolfram Research
Wolfram Science World: Islamic Calendar
A very brief description of the Islamic calendar, which "has its starting point at the date of the flight of Mohammed from Mecca to Medina." Describes the format of the Islamic year in comparison to the Gregorian calendar.
ClassFlow
Class Flow: Calendar
[Free Registration/Login Required] The history of our calendar is presented through the passage of time with complete cycles of seasons in ancient history providing a starting place. Complete cycles of seasons are discussed and the...
Institute for Dynamic Educational Advancement
Our Year
The concept of a year in time and the various kinds of year used in human timekeeping are discussed.
Library of Congress
Loc: George Washington Was Born Feb. 22
An interesting background on the origin of Presidents' Day, and the actual date of George Washington's birth. Includes a portrait of Washington, as well as an historical letter from Tobias Lear, recounting the Julian and Gregorian...
Other
Cyber Kids: Happy Hanukkah
Brief description of why Hanukkah falls on different days every year. Illustrates the differences between the Gregorian and Jewish calendars.
Curated OER
Cyber Kids: Happy Hanukkah
Brief description of why Hanukkah falls on different days every year. Illustrates the differences between the Gregorian and Jewish calendars.
Wolfram Research
Wolfram Science World: Bede, the Venerable
Encyclopedia entry for the English scholar who wrote a history of the early centuries of Anglo-Saxon England and an encyclopedia which consisted largely of excerpts from Pliny the Elder.