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The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.
Some calendars listed are identical to the Gregorian calendar except for substituting regional month names or using a different calendar epoch. For example, the Thai solar calendar (introduced 1888) is the Gregorian calendar using a different epoch (543 BC) and different names for the Gregorian months (Thai names based on the signs of the zodiac).
The Gregorian calendar did not exist before October 15, 1582. Gregorian dates before that are proleptic, that is, using the Gregorian rules to reckon backward from October 15, 1582. Years are given in astronomical year numbering. Augustus corrected errors in the observance of leap years by omitting leap days until AD 8.
The seven calendars may be combined into one, either with 13 columns of which only seven are revealed, [2] [3] or with movable day-of-week names (as shown in the pocket perpetual calendar picture). A mixture of the above two variations - a one-year calendar in which the names of the months are fixed and the days of the week and dates are shown ...
The Arabic names of the months of the Gregorian calendar are usually phonetic Arabic pronunciations of the corresponding month names used in European languages. An exception is the Assyrian calendar used in Iraq and the Levant, whose month names are inherited via Classical Arabic from the Babylonian and Hebrew lunisolar calendars and correspond to roughly the same time of year.
A month is a unit of time, used with calendars, that is approximately as long as a natural phase cycle of the Moon; the words month and Moon are cognates.The traditional concept of months arose with the cycle of Moon phases; such lunar months ("lunations") are synodic months and last approximately 29.53 days, making for roughly 12.37 such months in one Earth year.
French Republican Calendar of 1794, drawn by Philibert-Louis Debucourt. The French Republican calendar (French: calendrier républicain français), also commonly called the French Revolutionary calendar (calendrier révolutionnaire français), was a calendar created and implemented during the French Revolution, and used by the French government for about 12 years from late 1793 to 1805, and ...
The Slavic names of the months have been preserved by a number of Slavic people in a variety of languages. The conventional month names in some of these languages are mixed, including names which show the influence of the Germanic calendar (particularly Slovene, Sorbian, and Polabian) [1] or names which are borrowed from the Gregorian calendar (particularly Polish and Kashubian), but they have ...