Calendars and Timekeeping
Calendars and Timekeeping Links
- The Chinese Calendar The mathematics of the Chinese calendar. Explains the rules for the Chinese calendar.
- Sidereal Time Clock Java applet displays the current local sidereal time for any longitude. You can enter the right ascension of an object and it will calculate the object's hour angle.
- Calendar Conversions A handy tool for converting to and from various calendars, including the Jewish calendar and the French Republican calendar.
- Astronomical Time Keeping Extensive descriptions of many astronomical time keeping systems, with information on time zones and Julian day numbers.
- Islamic Calendar Islamic months begin at sunset on the day of visual sighting of the lunar crescent. This site discusses the concept of the International Lunar Date Line and contains numerous maps of crescent visibility.
- Moonstick Information Site Describes a slide rule moon phase calendar and provides other methods of computing astronomical information.
- Astronomy.com: Calendar of Events Calendar of Events offers major sky events including meteor showers, lunar and solar eclipses, comets, asteroids and more. You can always plan ahead with Astronomy.com's Calendar of Events.
- 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.
- Lunisolar Calendar Calendar with lunations, from new moon to new moon, instead of months. Moon phase on each day. Chinese, Jewish, and Islamic months. Eclipses, meteors, planets, star charts. Christian, Pagan, Islamic, Hindu, and Jewish holidays.
- The Islamic Calendar The mathematics of the Islamic calendar in Singapore.
- Month Calendar for Any Year Create a calendar, month poetry, how the months got their names, day names in different languages, birthstones, gemstones, Roman gods and the blue moon.
- The Correct Time and Moon Phase Shows the current phase of the moon and gives the correct time from the atomic clock at the United States Naval Observatory.
- Time and Date 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.
- Calendars through the Ages History and FAQ's of calendars, from ancient Rome to outer space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan.
- Calendopaedia The Encyclopaedia of Calendars.
- The Calendar, Leap Years and the Year 2000 An explanation of the calendar including the origin of the day, week, month and year.
- Britannica.com - Clockworks: From Sundials to the Atomic Second Britannica.com explores the history of timekeeping, from sundials to cesium atomic clocks.
- Annus Novus Decimal Calendar A proposal for a non-sectarian, culturally neutral calendar system.
- Time and Dates Information on date, time, and time zones from the New York Public Library.
- Blue Moon Myths Second full moon in a month, or third full moon in a single season?
- The Difference Between the Millennium and Year 2000 Questions and answers to satisfy the hearts of true millennium buffs.
- 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.
- 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 complete view of Maya culture.
- Indian Moons A list of many American Indian tribe's names for months, days, and other calendar related information.
- 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.
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