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The seven-day week was adopted in early Christianity from the Hebrew calendar, and gradually replaced the Roman internundinum. [citation needed] Sunday remained the first day of the week, being considered the day of the sun god Sol Invictus and the Lord's Day, while the Jewish Sabbath remained the seventh.
The ancient Athenian calendar was a lunisolar calendar with 354-day years, consisting of twelve months of alternating length of 29 or 30 days. To keep the calendar in line with the solar year of 365.242189 days, an extra, intercalary month was added in the years: 3, 6, 8, 11, 14, 17, 19 of the 19-years Metonic cycle.
A full calendar system has a different calendar date for every day. [20] [21] Thus the week cycle is by itself not a full calendar system; [22] neither is a system to name the days within a year without a system for identifying the years. The simplest calendar system just counts time periods from a reference date. [23]
An eight-day week was used in Ancient Rome and possibly in the pre-Christian Celtic calendar. Traces of a nine-day week are found in Baltic languages and in Welsh. The ancient Chinese calendar had a ten-day week, as did the ancient Egyptian calendar (and, incidentally, the French Republican Calendar, dividing its 30-day months into thirds).
The modern Hebrew calendar has been designed to ensure that certain holy days and festivals do not fall on certain days of the week. As a result, there are only four possible patterns of days on which festivals can fall. (Note that Jewish days start at sunset of the preceding day indicated in this article.)
A 50-year "pocket calendar" that is adjusted by turning the dial to place the name of the month under the current year. One can then deduce the day of the week or the date. A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future.
On This Day; BBC: On This Day; The New York Times: On This Day; Library of Congress: Today in History; History Channel (US): This Day in History; History Channel (UK): This Day in History; New Zealand Government: Today in New Zealand History Archived 2017-04-14 at the Wayback Machine; Computer History Museum: This Day in History
Afrikaans; Alemannisch; Аԥсшәа; العربية; Aragonés; ܐܪܡܝܐ; Armãneashti; Arpetan; Asturianu; Azərbaycanca; বাংলা; Banjar; Башҡортса
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