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. Visit

Maya Calendar 2000 -- The calendar was the center of Maya life & 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. Visit

Rosetta Calendar -- An on line handy tool for converting to & from the Gregorian, Julian & Jewish calendars. Visit

The Calendar, Leap Years & the Year 2000 -- An explanation of the calendar including the origin of the day, week, month & year. Visit

Time & Date -- Lots of time & date related information, such as yearly & monthly calendars, counters, countdown, & the world clock which shows the current time in cities all over the world. Visit

Annus Novus Decimal Calendar -- A proposal for a non-sectarian, culturally neutral calendar system. Visit

LunarCal - A Perpetual Chinese Lunar Calendar -- LunarCal is a 160-year perpetual Chinese Lunar Calendar for 1900 to 2060. Chinese festivals are listed & the moon phase is displayed. Visit

Hindu Calendar Dates 52nd Century -- Explains the cosmological & astronomical influences in creating the Indian calendar. Visit

Astro Portal - CalSKY -- The worldwide interactive on line astronomical/space calendar & calculator - for friends of astronomy, as well as astronomers. Visit

Indian Moons -- A list of many American Indian tribe's names for months, days, and other calendar related information. Visit

The Chinese Calendar -- The mathematics of the Chinese calendar. Explains the rules for the Chinese calendar. Visit

Types of Calendars -- An explanation of lunar, solar, lunisolar, rule-based & other types of calendars. Visit