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Astro Portal - CalSKY
The worldwide interactive online astronomical/space calendar and calculator - for friends of astronomy, as well as astronomers.
Time and Dates
Information on date, time, and time zones from the New York Public Library.
Rosetta Calendar
An online handy tool for converting to and from the Gregorian, Julian and Jewish calendars.
Blue Moon Myths
Second full moon in a month, or third full moon in a single season?
Calendar Studies
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.
LunarCal - A Perpetual Chinese Lunar Calendar
LunarCal is a 160-year perpetual Chinese Lunar Calendar for 1900 to 2060. Chinese festivals are listed and the moon phase is displayed.
Calendrical Calculations
Published by Cambridge University Press. Gives a unified algorithmic presentation of the Gregorian, ISO, Julian, Coptic, Ethiopic, and Islamic civil calendars.
Indian Moons
A list of many American Indian tribe's names for months, days, and other calendar related information.
Astronomical Time Keeping
Extensive descriptions of many astronomical time keeping systems, with information on time zones and Julian day numbers.
The Chinese Calendar
The mathematics of the Chinese calendar. Explains the rules for the Chinese calendar.
More Calendars and Timekeeping Sites
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