Archaeoastronomy 90
Clocks 6
ISO 8601 Standard 48
Lunar Phases 18
Sundials 23
Sunrise and Sunset Times 13
| | Time - Astronomy and Space, Science, School Time, Kids and Teens 25
Time - Reference 87
Sky Calendars - Amateur, Astronomy, Science 15
ISO 8601 - ISO, Individual Standards, Standards, Reference, Science 48
Metrology - Technology, Science 85
Calendars and Lists - Holidays, Society 24
 ACalendar.comACalendar.com
 The calendar has many options with a standard monthly interface, including sunrise, sunset, and Moon phases.
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Annus Novus Decimal CalendarAnnus Novus Decimal Calendar
 A proposal for a non-sectarian, culturally neutral calendar system.
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Astro Portal - CalSKYAstro Portal - CalSKY
 The worldwide interactive online astronomical/space calendar and calculator - for friends of astronomy, as well as astronomers.
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Astronomical Time KeepingAstronomical Time Keeping
 Extensive descriptions of many timing systems, with information on time zones and Julian day numbers.
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Astronomy and Space CalendarAstronomy and Space Calendar
 Features different views of the night sky, constellations, stars, planets, and other celestial wonders.
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Astronomy by JavaScript: Sun Calculators and MoreAstronomy by JavaScript: Sun Calculators and More
 Applets related to calendars and keeping time, including sidererial time.
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Blue Moon MythsBlue Moon Myths
 Second full moon in a month, or third full moon in a single season.
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Britannica.com - Clockworks: From Sundials to the Atomic SecondBritannica.com - Clockworks: From Sundials to the Atomic Second
 Britannica.com explores the history of timekeeping, from sundials to cesium atomic clocks.
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The Calendar, Leap Years and the Year 2000The Calendar, Leap Years and the Year 2000
 An explanation of the calendar including the origin of the day, week, month and year.
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Calendar StudiesCalendar 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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Calendars through the AgesCalendars through the Ages
 History and FAQs of calendars, from ancient Rome to outer space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan.
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CalendopaediaCalendopaedia
 The encyclopaedia of calendars.
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Calendrical CalculationsCalendrical Calculations
 Published by Cambridge University Press. Gives a unified algorithmic presentation of the Gregorian, ISO, Julian, Coptic, Ethiopic, and Islamic civil calendars.
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The Chinese CalendarThe Chinese Calendar
 The mathematics and rule explanation for the calendar.
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The Difference Between the Millennium and Year 2000The Difference Between the Millennium and Year 2000
 Questions and answers to satisfy the hearts of true millennium buffs.
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GMT: Greenwich Mean TimeGMT: Greenwich Mean Time
 Complete guide to times in every time zone in the world.
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Hindu Calendar Dates 52nd CenturyHindu Calendar Dates 52nd Century
 Explains the cosmological and astronomical influences in creating the Indian calendar.
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Indian MoonsIndian Moons
 A list of many American Indian tribe's names for months, days, and other calendar related information.
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The Islamic CalendarThe Islamic Calendar
 The mathematics of the calendar in Singapore.
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The Julian and Gregorian CalendarsThe Julian and Gregorian Calendars
 Explanations of the Julian Calendar, the Gregorian Reform, the adoption of the Gregorian Calendar, the length of the tropical year and related matters.
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Julian Day NumbersJulian Day Numbers
 An explanation of the Julian day number system used by astronomers and calendricists.
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Leap SecondsLeap Seconds
 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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LunarCal - A Perpetual Chinese Lunar CalendarLunarCal - 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.
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Lunisolar CalendarLunisolar Calendar
 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.
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Maya Calendar 2000Maya 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.
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Millennium MistakeMillennium Mistake
 Explains the difference between millennium and year 2000 as the absence of a year zero.
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PlexGlobe: International Clock and Global KitPlexGlobe: International Clock and Global Kit
 A productivity toolkit for global users and businesses that includes world clock and calendar.
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Rosetta CalendarRosetta Calendar
 An online handy tool for converting to and from the Gregorian, Julian and Jewish calendars.
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Time and DateTime and Date
 Information such as yearly and monthly calendars, counters, countdown, and the world clock which shows the current time in cities all over the world.
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Time and DatesTime and Dates
 Information on date, time, and time zones from the New York Public Library.
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Types of CalendarsTypes of Calendars
 An explanation of lunar, solar, lunisolar, rule-based and other calendars.
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World Holidays: Weeks and MonthsWorld Holidays: Weeks and Months
 Information on the origin of the week, and etymology of month and weekday names.
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