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Time and Date - http://www.timeanddate.com/
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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Calendars through the Ages - http://webexhibits.org/calendars/
History and FAQs of calendars, from ancient Rome to outer space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan. |
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Leap Seconds - http://tycho.usno.navy.mil/leapsec.html
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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GMT: Greenwich Mean Time - http://wwp.greenwichmeantime.com/
Complete guide to times in every time zone in the world. |
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The Difference Between the Millennium and Year 2000 - http://www.timeanddate.com/counters/mil2000.html
Questions and answers to satisfy the hearts of true millennium buffs. |
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Astro Portal - CalSKY - http://www.calsky.com/
The worldwide interactive online astronomical/space calendar and calculator - for friends of astronomy, as well as astronomers. |
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Calendar Studies - http://www.hermetic.ch/cal_stud.htm
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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Calendopaedia - http://calendopedia.com/
The encyclopaedia of calendars. |
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Indian Moons - http://www.americanindian.net/moons.html
A list of many American Indian tribe's names for months, days, and other calendar related information. |
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The Chinese Calendar - http://www.math.nus.edu.sg/aslaksen/calendar/chinese.shtml
The mathematics and rule explanation for the calendar. |
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Astronomical Time Keeping - http://www.maa.mhn.de/Scholar/times.html
Extensive descriptions of many timing systems, with information on time zones and Julian day numbers. |
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Calendrical Calculations - http://emr.cs.uiuc.edu/home/reingold/calendar-book/index.shtml
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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Rosetta Calendar - http://rosettacalendar.com/
An online handy tool for converting to and from the Gregorian, Julian and Jewish calendars. |
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Julian Day Numbers - http://www.hermetic.ch/cal_stud/jdn.htm
An explanation of the Julian day number system used by astronomers and calendricists. |
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Britannica.com - Clockworks: From Sundials to the Atomic Second - http://www.britannica.com/clockworks
Britannica.com explores the history of timekeeping, from sundials to cesium atomic clocks. |
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The Julian and Gregorian Calendars - http://www.hermetic.ch/cal_stud/cal_art.html
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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Millennium Mistake - http://www.millenniummistake.net/
Explains the difference between millennium and year 2000 as the absence of a year zero. |
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Blue Moon Myths - http://www.infoplease.com/spot/bluemoon1.html
Second full moon in a month, or third full moon in a single season. |
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Lunisolar Calendar - http://www.pburch.net/lunarcal.html
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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Types of Calendars - http://www.hermetic.ch/cal_stud/lunarcal/types.htm
An explanation of lunar, solar, lunisolar, rule-based and other calendars. |
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The Calendar, Leap Years and the Year 2000 - http://chemistry.csudh.edu/oliver/smt310-handouts/calendar.htm
An explanation of the calendar including the origin of the day, week, month and year. |
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PlexGlobe: International Clock and Global Kit - http://www.plexobject.com/software/plexglobe/
A productivity toolkit for global users and businesses that includes world clock and calendar. |
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Astronomy and Space Calendar - http://www.newarkmuseum.org/PermanentCollection/PermanentPlanetariumCollection.aspx?id=1816
Features different views of the night sky, constellations, stars, planets, and other celestial wonders. |
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Astronomy by JavaScript: Sun Calculators and More - http://www.jgiesen.de/astro/astroJS/
Applets related to calendars and keeping time, including sidererial time. |
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ACalendar.com - http://www.acalendar.com/
The calendar has many options with a standard monthly interface, including sunrise, sunset, and Moon phases. |