Archaeoastronomy@ Clocks@ ISO 8601 Standard@ Lunar Phases@ Sundials Sunrise and Sunset Times@

» ACalendar.com    The calendar has many options with a standard monthly interface, including sunrise, sunset, and Moon phases.    http://www.acalendar.com/

» Annus Novus Decimal Calendar    A proposal for a non-sectarian, culturally neutral calendar system.    http://www.atlantium.org/calendaran.html

» Astro Portal - CalSKY    The worldwide interactive online astronomical/space calendar and calculator - for friends of astronomy, as well as astronomers.    http://www.calsky.com/

» Astronomical Time Keeping    Extensive descriptions of many timing systems, with information on time zones and Julian day numbers.    http://www.maa.mhn.de/Scholar/times.html

» Astronomy and Space Calendar    Features different views of the night sky, constellations, stars, planets, and other celestial wonders.    http://www.newarkmuseum.org/PermanentCollection/PermanentPlanetariumCollection.aspx?id=1816

» Astronomy by JavaScript: Sun Calculators and More    Applets related to calendars and keeping time, including sidererial time.    http://www.jgiesen.de/astro/astroJS/

» Blue Moon Myths    Second full moon in a month, or third full moon in a single season.    http://www.infoplease.com/spot/bluemoon1.html

» Britannica.com - Clockworks: From Sundials to the Atomic Second    Britannica.com explores the history of timekeeping, from sundials to cesium atomic clocks.    http://www.britannica.com/clockworks

» 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.    http://www.hermetic.ch/cal_stud.htm

» Calendars through the Ages    History and FAQs of calendars, from ancient Rome to outer space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan.    http://webexhibits.org/calendars/

» Calendopaedia    The encyclopaedia of calendars.    http://calendopedia.com/

» Calendrical Calculations    Published by Cambridge University Press. Gives a unified algorithmic presentation of the Gregorian, ISO, Julian, Coptic, Ethiopic, and Islamic civil calendars.    http://emr.cs.uiuc.edu/home/reingold/calendar-book/index.shtml

» GMT: Greenwich Mean Time    Complete guide to times in every time zone in the world.    http://wwp.greenwichmeantime.com/

» Hindu Calendar Dates 52nd Century    Explains the cosmological and astronomical influences in creating the Indian calendar.    http://senthilarumugam.tripod.com/id10.html

» Indian Moons    A list of many American Indian tribe's names for months, days, and other calendar related information.    http://www.americanindian.net/moons.html

» Julian Day Numbers    An explanation of the Julian day number system used by astronomers and calendricists.    http://www.hermetic.ch/cal_stud/jdn.htm

» Leap 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.    http://tycho.usno.navy.mil/leapsec.html

» LunarCal - 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.    http://www.geocities.com/lunarcal/

» Lunisolar 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.    http://www.pburch.net/lunarcal.html

» 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    http://mayacalendar.com

» Millennium Mistake    Explains the difference between millennium and year 2000 as the absence of a year zero.    http://www.millenniummistake.net/

» PlexGlobe: International Clock and Global Kit    A productivity toolkit for global users and businesses that includes world clock and calendar.    http://www.plexobject.com/software/plexglobe/

» Rosetta Calendar    An online handy tool for converting to and from the Gregorian, Julian and Jewish calendars.    http://rosettacalendar.com/

» The Calendar, Leap Years and the Year 2000    An explanation of the calendar including the origin of the day, week, month and year.    http://chemistry.csudh.edu/oliver/smt310-handouts/calendar.htm

» The Chinese Calendar    The mathematics and rule explanation for the calendar.    http://www.math.nus.edu.sg/aslaksen/calendar/chinese.shtml

» The Difference Between the Millennium and Year 2000    Questions and answers to satisfy the hearts of true millennium buffs.    http://www.timeanddate.com/counters/mil2000.html

» The Islamic Calendar    The mathematics of the calendar in Singapore.    http://www.math.nus.edu.sg/aslaksen/calendar/islamic.shtml

» The 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.    http://www.hermetic.ch/cal_stud/cal_art.html

» Time 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.    http://www.timeanddate.com/

» Time and Dates    Information on date, time, and time zones from the New York Public Library.    http://www.circ.uab.edu/nypldr/1time/index.htm

» Types of Calendars    An explanation of lunar, solar, lunisolar, rule-based and other calendars.    http://www.hermetic.ch/cal_stud/lunarcal/types.htm

» World Holidays: Weeks and Months    Information on the origin of the week, and etymology of month and weekday names.    http://www.gkindia.com/holidays/weekdays.htm