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Calendars and Timekeeping (Subscribe)

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Sundials (21)

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World Holidays: Weeks and Months

http://www.gkindia.com/holidays/weekdays.htm

Information on the origin of the week, and etymology of month and weekday names.

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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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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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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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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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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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Maya Calendar 2000

http://mayacalendar.com/

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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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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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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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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Indian Moons

http://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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Hindu Calendar Dates 52nd Century

http://senthilarumugam.tripod.com/id10.html

Explains the cosmological and astronomical influences in creating the Indian calendar.

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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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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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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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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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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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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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