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The World Calendar is a proposed reform of the Gregorian calendar created by Elisabeth Achelis in 1930. It has equal quarters of 91 days each, two additional days at the end of the year, and a simple date system based on week and month.
The Gregorian calendar is the calendar used in most parts of the world since 1582. It is a modification of the Julian calendar that corrects the drift of the equinoxes and adds a leap day every four years, except for centurial years divisible by 400.
Learn about the origins and evolution of various calendar systems from prehistory to the present. Find out how different cultures and civilizations used timekeeping methods based on astronomy, agriculture and culture.
Learn about the Celtic calendar, a compilation of pre-Christian Celtic systems of timekeeping, including the Gaulish Coligny calendar, used by Celtic countries to define the beginning and length of the day, the week, the month, the seasons, quarter days, and festivals. Compare the Celtic calendar with the astronomical and meteorological calendars, and see the native and borrowed terms in ...
A comprehensive list of historical and proposed calendars, grouped by type (solar, lunisolar, lunar, seasonal) and cultural or historical context. Learn about the origins, features and usage of different calendars, such as the Hebrew, Egyptian, Mayan, Gregorian and more.
A calendar is a system of organizing days by giving names to periods of time, such as days, weeks, months and years. Learn about the etymology, history and types of calendars, from lunar and solar to lunisolar and modern.
Learn about the various regional calendars used by the ancient Greeks, based on the lunar cycle and the religious festivals. Compare the month names, intercalary months, and synchronisms of different city-states and leagues.
Learn about the runic calendar, a perpetual calendar used in Northern Europe until the 19th century. It is based on the 19 year-long Metonic cycle and marks special days with runes or symbols.
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