| Aztec Calendar - Gregorian-to-Aztec date conversion, with Aztec astrological notes.
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| Ethiopian Calendar - Discusses which calendar Ethiopia uses and gives a list of the month's names and public holidays in Ethiopia.
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| The French Revolutionary Calendar - Convert any date since 1792 to the Jacobin calendar, a calendar that came out of the French Revolution but was ultimately not permanently adopted.
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| Religious Calendars and Holy Days - Explanations of the Christian, Jewish, Muslim, Hindu, Buddhist, Sikh, Bahai, and Wiccan calendars. Also includes a list of holidays associated with these calendars.
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| Several Calendars - Learn some basic information about the Egyptian, Roman, Gregorian, Mayan, Islamic, Jewish, and Julian calendars. Also learn how to calculate Easter.
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| The Moon's Phase - Online calculator that lets you see which phase the moon is in for any date in any year.
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| Online Catholic Calendar - Gives the dates, month by month, of all the traditional feast and holy days for the Roman Catholic Church.
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| Indian Moons - A list of many American Indian tribe's names for months, days, and other calendar related information.
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| Regional Islamic Calendar - The months of the Islamic calendar and when they occur in the Americas, Europe-Africa-Asia, and Asia-Pacific.
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| Virtual Perpetual Calendars - Lets you know what any calendar looks like for the 20th and 21st centuries. Also includes holidays, leap years, which years a particular day of the week always falls on, and methods of calculation.
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| Zoroastrian Religious Calendar - Three versions of the Zoroastrian calendar from the most ancient to more modern calendars.
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| TimeandDate.com: Calendar - All 12 months, plus lunar phases and some holidays noted.
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| Calendars Through the Ages - Discusses currently used and unused calendars such as Chinese, Christian, Indian, Islamic, Jewish, Ethiopian, Balinese, Bahai, the French, Mayan, Roman, and some modern schemes for calendar reform. Includes timelines and all about how our week came into being.
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| The Current Calendar System - Learn about our current calendar, daylight saving time, old clocks, new and atomic clocks, and when the millennium begins.
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| Calculate the Day of the Week - Shows a method to calculate the day of the week for any past or future date. Computer based methods are also shown.
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| Leap Years - The Royal Observatory at Greenwich explains why we have leap years.
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| Leap Year - The Forest Preserve District of Cook County Illinois explains leap year.
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| Algebra - Fun with Calendars - Perform some mental "magic" tricks based on math and the calendar.
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| Years - How a year is figured and who invented our calendar.
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| Phase of the Moon - Calendar showing the phase of the moon for this month or a month/year of your choice.
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| Cosmic Calendar - Imagine if the history of the universe, all 13 billion years of it, were put into just one year. What would that calendar look like? Carl Sagan, the famous astronomer, made this one.
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| Time and Date - Lots of time and date related 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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| What a Calendar Is - World Book Encyclopedia takes a look at calendars, including the history of calendars, calendars in use today, ancient calendars, and what a new calendar might look like.
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| Counting the Days - World Book Encyclopedia takes a look at calendars, including the history of calendars, and educational activities that relate to calendars.
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| History of the Calendar - How different parts of the world made different kinds of clocks based on where they lived and what kind of weather they had to predict.
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| The Ancient Calendar - The ancient calendar, its origin, problems, and development, plus a look at the names of days of the week
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| Counting: Calendars and Cords - A look at the methods ancient civilizations used to keep track of time.
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| Calendars: Counting the Days - World Book Encyclopedia takes a look at calendars, including the history of calendars, and educational activities that relate to calendars.
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| Japanese Calendar - Converts Japanese to Western calendar dates.
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| Calendopaedia - The Encyclopaedia of Calendars.
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| Calendar, a History - A history of the western calendar, including the Gregorian and Julian and Roman Calendars, and how the days of the week and months got their names, and a history of time.
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| 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.
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| Today's Date - Today's date from the Gregorian calendar that we use into the calendar dates of the Mayan, French, Islamic, Hebrew, Julian, Ethiopic, Coptic, Chinese, Julian, and Discordian calendars.
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| Date Algorithms - Provides descriptions, proofs and computer programming implementation examples to convert dates to various calendar dates for Julian, Gregorian, and Rata Die calendars.
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| Western-Chinese Calendar Converter - Tool to convert between the traditional Chinese lunar calendar and the Western solar calendar. Also offers a brief description of the two different calendars and lists links about the Chinese calendar.
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