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Top / Science / Astronomy / Calendars_and_Timekeeping /

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 Navy.mil  ~   Site Info   Whois   Trace Route   RBL Check   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 Mhn.de  ~   Site Info   Whois   Trace Route   RBL Check   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/ Timeanddate.com  ~   Site Info   Whois   Trace Route   RBL Check   Blue Moon Myths Second full moon in a month, or third full moon in a single season. http://www.infoplease.com/spot/bluemoon1.html Infoplease.com  ~   Site Info   Whois   Trace Route   RBL Check   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 Mayacalendar.com  ~   Site Info   Whois   Trace Route   RBL Check   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 Britannica.com  ~   Site Info   Whois   Trace Route   RBL Check   The Chinese Calendar The mathematics and rule explanation for the calendar. http://www.math.nus.edu.sg/aslaksen/calendar/chinese.shtml Nus.edu.sg  ~   Site Info   Whois   Trace Route   RBL Check   The Islamic Calendar The mathematics of the calendar in Singapore. http://www.math.nus.edu.sg/aslaksen/calendar/islamic.shtml Nus.edu.sg  ~   Site Info   Whois   Trace Route   RBL Check   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 Timeanddate.com  ~   Site Info   Whois   Trace Route   RBL Check   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/ Webexhibits.org  ~   Site Info   Whois   Trace Route   RBL Check