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Leap Seconds
Civil time is occasionally adjusted by one second increments. A detailed explanation of what a second actually is, and why leap seconds are necessary.
http://tycho.usno.navy.mil/leapsec.html
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Astronomical Time Keeping
Extensive descriptions of many timing systems, with information on time zones and Julian day numbers.
http://www.maa.mhn.de/Scholar/times.html
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Time and Date
Information such as yearly and monthly calendars, counters, countdown, and the world clock which shows the current time in cities all over the world.
http://www.timeanddate.com/
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Blue Moon Myths
Second full moon in a month, or third full moon in a single season.
http://www.infoplease.com/spot/bluemoon1.html
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Maya Calendar 2000
The calendar was the center of Maya life and their greatest cultural achievement. To carry out their astronomical calculations they developed a sophisticated mathematical system. The Maya Calendar website is developing with the intent of providing a comp
http://mayacalendar.com
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Britannica.com - Clockworks: From Sundials to the Atomic Second
Britannica.com explores the history of timekeeping, from sundials to cesium atomic clocks.
http://www.britannica.com/clockworks
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The Chinese Calendar
The mathematics and rule explanation for the calendar.
http://www.math.nus.edu.sg/aslaksen/calendar/chinese.shtml
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The Islamic Calendar
The mathematics of the calendar in Singapore.
http://www.math.nus.edu.sg/aslaksen/calendar/islamic.shtml
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The Difference Between the Millennium and Year 2000
Questions and answers to satisfy the hearts of true millennium buffs.
http://www.timeanddate.com/counters/mil2000.html
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Calendars through the Ages
History and FAQs of calendars, from ancient Rome to outer space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan.
http://webexhibits.org/calendars/
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