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Top > Astronomy > Calendars and Timekeeping
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| Sundials (23) |
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1. Leap Seconds
Civil time is occasionally adjusted by one second increments called leap seconds. A detailed explanation of what a second actually is, and why leap seconds are necessary.
Date Added: Mar 16, 2008 Hits: Rating: 0.00 Votes: 0
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Extensive descriptions of many astronomical time keeping systems, with information on time zones and Julian day numbers.
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Lots of time and date related information, such as yearly and monthly calendars, counters, countdown, and the world clock which shows the current time in cities all over the world.
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Information on date, time, and time zones from the New York Public Library.
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Second full moon in a month, or third full moon in a single season?
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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 complete view of Maya culture.
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Britannica.com explores the history of timekeeping, from sundials to cesium atomic clocks.
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Articles on the Gregorian and Julian calendars, the ISO date format, the Julian day number system, the Maya calendar, the Goddess lunar calendar, the Liberalia Triday Calendar and C functions for date conversion; plus software for calendrical conversion.
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LunarCal is a 160-year perpetual Chinese Lunar Calendar for 1900 to 2060. Chinese festivals are listed and the moon phase is displayed.
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The mathematics of the Chinese calendar. Explains the rules for the Chinese calendar.
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