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Astronomical Time Keeping (Popularity:  )
http://www.maa.mhn.de/Scholar/times.html
Extensive descriptions of many astronomical time keeping systems, with information on time zones and Julian day numbers.
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Time and Date (Popularity: )
http://www.timeanddate.com/
Lots of time and date related information, such as yearly and monthly calendars, counters, countdown, and the world clock which ...
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Blue Moon Myths (Popularity: )
http://www.infoplease.com/spot/bluemoon1.html
Second full moon in a month, or third full moon in a single season?
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Maya Calendar 2000 (Popularity: )
http://mayacalendar.com
The calendar was the center of Maya life and their greatest cultural achievement. To carry out their astronomical calculations they ...
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Britannica.com - Clockworks: From Sundials to the Atomic Second (Popularity: )
http://www.britannica.com/clockworks
Britannica.com explores the history of timekeeping, from sundials to cesium atomic clocks.
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Calendar Studies (Popularity: )
http://hermetic.nofadz.com/cal_stud.htm
Articles on the Gregorian and Julian calendars, the ISO date format, the Julian day number system, the Maya calendar, the ...
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LunarCal - A Perpetual Chinese Lunar Calendar (Popularity: )
http://www.geocities.com/lunarcal
LunarCal is a 160-year perpetual Chinese Lunar Calendar for 1900 to 2060. Chinese festivals are listed and the moon phase ...
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The Chinese Calendar (Popularity: )
http://www.math.nus.edu.sg/aslaksen/calendar/chinese.shtml
The mathematics of the Chinese calendar. Explains the rules for the Chinese calendar.
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The Islamic Calendar (Popularity: )
http://www.math.nus.edu.sg/aslaksen/calendar/islamic.shtml
The mathematics of the Islamic calendar in Singapore.
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The Difference Between the Millennium and Year 2000 (Popularity: )
http://www.timeanddate.com/counters/mil2000.html
Questions and answers to satisfy the hearts of true millennium buffs.
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Calendars through the Ages (Popularity: )
http://webexhibits.org/calendars/
History and FAQs of calendars, from ancient Rome to outer space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan.
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Annus Novus Decimal Calendar (Popularity: )
http://www.atlantium.org/calendaran.html
A proposal for a non-sectarian, culturally neutral calendar system.
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Astronomy by JavaScript: Sun Calculators and More (Popularity: )
http://www.jgiesen.de/astro/astroJS/
Applets related to calendars and keeping time, including sidererial time.
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Calendrical Calculations (Popularity: )
http://emr.cs.uiuc.edu/home/reingold/calendar-book/index.shtml
Published by Cambridge University Press. Gives a unified algorithmic presentation of the Gregorian, ISO, Julian, Coptic, Ethiopic, and Islamic civil ...
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Calendopaedia (Popularity: )
http://www.geocities.com/calendopaedia/
The Encyclopaedia of Calendars.
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Millennium Mistake (Popularity: )
http://www.millenniummistake.net/
Explains the difference between millenium and year 2000 as the absence of a year zero.
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Rosetta Calendar (Popularity: )
http://rosettacalendar.com/
An online handy tool for converting to and from the Gregorian, Julian and Jewish calendars.
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The Calendar, Leap Years and the Year 2000 (Popularity: )
http://chemistry.csudh.edu/oliver/smt310-handouts/calendar.htm
An explanation of the calendar including the origin of the day, week, month and year.
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Indian Moons (Popularity: )
http://www.americanindian.net/moons.html
A list of many American Indian tribe's names for months, days, and other calendar related information.
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Astro Portal - CalSKY (Popularity: )
http://www.calsky.com/
The worldwide interactive online astronomical/space calendar and calculator - for friends of astronomy, as well as astronomers.
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