Calendars and Timekeeping Astronomy Science


Civil time is occasionally adjusted by one second increments. A detailed explanation of what a second actually is, and why leap seconds are necessary.








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Calendars and Timekeeping


See Also:
  • Calendrical Calculations - Published by Cambridge University Press. Gives a unified algorithmic presentation science of the Gregorian, ISO, Julian, Coptic, Ethiopic, and Islamic civil science calendars.
  • 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 compl
  • Julian Day Numbers - An explanation of the Julian day number system calendars and timekeeping used by astronomers and calendricists.
  • GMT: Greenwich Mean Time - Complete guide to times in every time zone in the science world.
  • Blue Moon Myths - Second full moon in a month, or third full moon in a single season.
  • Time and Date - Information such as yearly and monthly calendars, counters, astronomy countdown, and science the world clock which shows the astronomy current time in cities science all over the world.
  • Lunisolar Calendar - Lunar calendar with lunations, from new moon to astronomy new moon, instead of months. Moon phase on astronomy each day. Chinese, Jewish, and Islamic months. Eclipses, astronomy meteors, planets, star charts. Christian, Pagan, Islamic, Hindu, astronomy and Jewish holidays.
  • ACalendar.com - The calendar has many options with a standard astronomy monthly interface, astronomy including sunrise, sunset, and Moon phases.
  • Annus Novus Decimal Calendar - A proposal for a non-sectarian, culturally neutral calendar system.
  • 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.
  • Britannica.com - Clockworks: From Sundials to the Atomic Second - Britannica.com explores the history of timekeeping, from sundials calendars and timekeeping to cesium atomic clocks.
  • Hindu Calendar Dates 52nd Century - Explains the cosmological and astronomical influences in creating the Indian science calendar.
  • The Julian and Gregorian Calendars - Explanations of the Julian Calendar, the Gregorian Reform, astronomy the adoption of the Gregorian Calendar, the length astronomy of the tropical year and related matters.
  • Indian Moons - A list of many American Indian tribe\\'s names for months, days, and other calendar related information.
  • LunarCal - A Perpetual Chinese Lunar Calendar - LunarCal is a 160-year perpetual Chinese Lunar Calendar for 1900 science to 2060. Chinese festivals are listed and the moon phase science is displayed.
  • The Difference Between the Millennium and Year 2000 - Questions and answers to satisfy the hearts of true millennium science buffs.
  • Astronomy and Space Calendar - Features different views of the night sky, constellations, science stars, planets, calendars and timekeeping and other celestial wonders.
  • PlexGlobe: International Clock and Global Kit - A productivity toolkit for global users and businesses calendars and timekeeping calendars and timekeeping that includes world clock and calendar.
  • Calendars through the Ages - History and FAQs of calendars, from ancient Rome to outer astronomy space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan.
  • Calendopaedia - The encyclopaedia of calendars.
  • The Chinese Calendar - The mathematics and rule explanation for the calendar.
  • Astronomy by JavaScript: Sun Calculators and More - Applets related to calendars and keeping time, including sidererial time.
  • World Holidays: Weeks and Months - Information on the origin of the week, and etymology of astronomy month and weekday names.
  • The Calendar, Leap Years and the Year 2000 - An explanation of the calendar including the origin of the science day, week, month and year.
  • Astro Portal - CalSKY - The worldwide interactive online astronomical/space calendar and calculator - for science friends of astronomy, as well as astronomers.
  • Leap Seconds - Civil time is occasionally adjusted by one second increments. A science detailed explanation of what a second actually is, and why science leap seconds are necessary.
  • The Islamic Calendar - The mathematics of the calendar in Singapore.
  • Millennium Mistake - Explains the difference between millennium and year 2000 calendars and timekeeping as the absence of a year zero.
  • Astronomical Time Keeping - Extensive descriptions of many timing systems, with information on time science zones and Julian day numbers.
  • Types of Calendars - An explanation of lunar, solar, lunisolar, rule-based and science other calendars.


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