Calendars and Timekeeping Astronomy Science

@Intermall

Top: Science: Astronomy: Calendars_and_Timekeeping:

• Top/Reference/Time
• Top/Society/Holidays/Calendars and Lists
• Top/Science/Astronomy/Solar System/Earth/Moon
• Top/Science/Astronomy/Amateur/Sky Calendars
• Top/Science/Reference/Standards/Individual Standards/ISO 8601
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• Top/Kids and Teens/School Time/Science/Astronomy and Space/Time

• - Explains the difference between millenium and year 2000 as the absence of a year zero.
  
• - A proposal for a non-sectarian, culturally neutral calendar system.
  
• - The mathematics of the Islamic calendar in Singapore.
  
• - An online handy tool for converting to and from the Gregorian, Julian and Jewish calendars.
  
• - 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 compl
  
• - Extensive descriptions of many astronomical time keeping systems, with information on time zones and Julian day numbers.
  
• - History and FAQs of calendars, from ancient Rome to outer space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan.
  
• - LunarCal is a 160-year perpetual Chinese Lunar Calendar for 1900 to 2060. Chinese festivals are listed and the moon phase is displayed.
  
• - An explanation of the calendar including the origin of the day, week, month and year.
  
• - Published by Cambridge University Press. Gives a unified algorithmic presentation of the Gregorian, ISO, Julian, Coptic, Ethiopic, and Islamic civil calendars.
  
• - 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.
  
• - Second full moon in a month, or third full moon in a single season?
  
• - Information on date, time, and time zones from the New York Public Library.
  
• - 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.
  
• - The Encyclopaedia of Calendars.
  
• - A list of many American Indian tribe's names for months, days, and other calendar related information.
  
• - The mathematics of the Chinese calendar. Explains the rules for the Chinese calendar.
  
• - Applets related to calendars and keeping time, including sidererial time.
  
• - Lunar 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.
  
• - Britannica.com explores the history of timekeeping, from sundials to cesium atomic clocks.
  
• - The worldwide interactive online astronomical/space calendar and calculator - for friends of astronomy, as well as astronomers.
  
• - Questions and answers to satisfy the hearts of true millennium buffs.
  
• - 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.