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General Calendar Information

A Walk Through Time
A NIST Physics Laboratory presentation - The Evolution of Time Measurement
http://physics.nist.gov/GenInt/Time/time.html

Gregorian Calendar
Albert Van Helden's history of the Gregorian calendar.
http://galileo.rice.edu/chron/gregorian.html

Ancient Calendars
Lots of information about the history of timekeeping. Includes excellent drawings of early devices.
http://physics.nist.gov/GenInt/Time/ancient.html

Calendars and Their History
This information is reprinted from the Explanatory Supplement to the Astronomical Almanac, P. Kenneth Seidelmann, editor, with permission from University Science Books, Sausalito, CA 94965.
http://astro.nmsu.edu/~lhuber/leaphist.html

Peter Meyer's Calendar Studies
Articles on various calendars (Gregorian, Maya, lunar, etc.) and calendrical topics.
http://www.hermetic.ch/cal_stud.htm

Julian Day Numbers
Article about the nature and origin of the Julian day number system.
http://www.hermetic.ch/cal_stud/jdn.htm

"Doomsday" Algorithm for day of week
The Doomsday algorithm gives you the day of the week (Sunday, Monday, etc.) for any date, and you can do it in your head.
http://rudy.ca/doomsday.html

US Navy Time Service Dept.
U.S. Naval Observatory, The Official Source of Time Used in the United States
http://tycho.usno.navy.mil/time.html

The Calendar
A comparison of various calendar systems.
http://www.pcug.org.au/~dfry/calendar.html

Calendar Months of the Year
Home to a group of fast-loading web pages that describe the history and development of calendar month and year lengths.
http://www.12x30.net/

Calendopaedia - The Encyclopedia of Calendars
A description and comparison of calendars from around the world and across time.
http://calendopedia.com/

World Birthday Web
Look up fellow netizens birthdays and submit your own.
http://www.boutell.com/birthday.cgi

Time Emits - Ages of Adam
Time Emits - Ages of Adam is about ancient calendars of the Holy Bible
http://timeemits.com/

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