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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