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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.
A calendar date is a reference to a particular day, represented within a calendar system, enabling a specific day to be unambiguously identified. Simple math can be performed between dates; commonly, the number of days between two dates may be calculated, e.g., "25 February 2025" is ten days after "15 February 2025".
A calendar era is the period of time elapsed since one epoch of a calendar and, if it exists, before the next one. [1] For example, the current year is numbered 2025 in the Gregorian calendar, which numbers its years in the Western Christian era (the Coptic Orthodox and Ethiopian Orthodox churches have their own Christian eras).
The three mean tropical years in Babylonian sexagesimals as the excess over 365 days (the way they would have been extracted from the tables of mean longitude) were 0;14,33,9,57 (Alfonsine), 0;14,33,11,12 (Copernicus) and 0;14,33,9,24 (Reinhold). [j] In decimal notation, these are equal to 0.24254606, 0.24255185, and 0.24254352, respectively ...
AD 15 was a common year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Caesar and Flaccus (or, less frequently, year 768 Ab urbe condita ).
The golden number of any Julian or Gregorian calendar year can be calculated by dividing the year by 19, taking the remainder, and adding 1. (In mathematics this can be expressed as (year number modulo 19) + 1.) For example, 2025 divided by 19 gives 106, remainder 11. Adding 1 to the remainder gives a golden number of 12.
Thu/Fri 14/15 Nov 2012 (Close to the Solar eclipse of November 13, 2012) 15 November [11] 1435 AH: Mon/Tue 4/5 Nov 2013 (Close to the Solar eclipse of November 3, 2013) 1436 AH: Fri/Sat 24/25 Oct 2014 (Close to the Solar eclipse of October 23, 2014) 1437 AH: Tue/Wed/Thu 13/14/15 Oct 2015: 1438 AH: Sun/Mon 2/3 Oct 2016: 1439 AH: Thu/Fri 21/22 ...
The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to the dates preceding its official introduction in 1582. In nations that adopted the Gregorian calendar after its official and first introduction, dates occurring in the interim period of 15 October 1582 (the first date of use of Gregorian calendrical dates, being dated 5 October 1582 in the preceding ...