“THE PROLEPTIC GREGORIAN CALENDAR”
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__*aka*__
“WESTERN CALENDAR”
“CHRISTIAN CALENDAR”
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*the “gregorian calendar” is (internationally) the most widely used ‘civil calendar’*
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(it is named for ‘pope gregory 13’, who introduced it in ‘october 1582’)
(the calendar was a refinement to the ‘julian calendar’ amounting to a 0.002% correction in the length of the year)
(the motivation for the reform was to bring the date for the celebration of “easter” to the time of the year in which it was celebrated when it was introduced by the ‘early church’)
(because the celebration of ‘easter’ was tied to the ‘spring equinox’, the ‘roman catholic church’ considered the ‘steady drift’ in the date of ‘easter’ caused by the year being slightly too long to be ‘undesirable’)
(the reform was adopted initially by the ‘catholic countries’ of ‘europe’)
(‘protestant’ + ‘eastern orthodox’ countries continued to use the traditional ‘julian calendar’ and adopted the ‘gregorian reform’ after a time, for the sake of ‘convenience’ in ‘international trade’)
(the last ‘european country’ to adopt the reform was ‘greece’ (in ‘1923’))
(the ‘gregorian reform’ contained 2 parts: a reform of the ‘julian calendar’ as used prior to pope gregory XIII’s time and a reform of the ‘lunar cycle’ used by the ‘church’ (with the ‘julian calendar’) to calculate the date of ‘easter’)
(the reform was a modification of a proposal made by ‘aloysius lilius’)
(his proposal included ‘reducing the # of ‘leap years’ in ‘4 centuries’ from ‘100’ to ’97’, by making 3 out of 4 centurial years ‘common’ instead of ‘leap’ years)
(‘lilius’ also produced an ‘original’ + ‘practical’ scheme for adjusting the ‘epacts’ of the moon when calculating the annual date of ‘easter’, solving a long-standing obstacle to ‘calendar reform’)
the ‘gregorian reform’ modified the julian calendar’s scheme of ‘leap years’ as follows –>
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“every year that is exactly divisible by 4 is a ‘leap year’, except for years that are exactly divisible by 100, but these centurial years are ‘leap years’ if they are exactly divisible by ‘400’”
(“for example, the years 1700, 1800, and 1900 are not ‘leap years’, but the year ‘2000’ is”)
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(in addition to the change in the ‘mean length’ of the ‘calendar year’ from ‘365.25 days’ (‘365 days’ / ‘6 hours’) to ‘365.2425 days’ (‘365 days’ / ‘5 hours’ / ’49 minutes’ / ’12 seconds’), a reduction of (’10 minutes’ / ’48 seconds’) per year, the ‘gregorian calendar reform’ also dealt with the ‘accumulated difference’ between these ‘lengths’)
(the ‘canonical easter tables’ were devised at the end of the ‘3rd century’, when the ‘vernal equinox’ fell either on ‘march 20th’ or ‘march 21st’ depending on the year’s position in the ‘leap year cycle’)
(as the rule was that the ‘full moon’ preceding ‘easter’ was not to precede the ‘equinox’)
(the ‘equinox’ was fixed at ‘march 21st’ for ‘computational purposes’ and the earliest date for ‘easter’ was fixed at ‘march 22nd’)
(the ‘gregorian calendar’ reproduced these conditions by removing ’10 days’)
(to unambiguously specify the date, ‘dual dating’ (or ‘old style’ (O.S.) and ‘new style’ (N.S.) are sometimes used with dates)
(‘dual dating’ uses 2 consecutive years because of differences in the starting date of the year, or includes both the ‘julian’ and ‘gregorian’ dates)
(‘old style’ and ‘new style’ (N.S.) indicate either whether the start of the ‘julian year’ has been adjusted to start on ‘january 1st’ (N.S.) even though documents written at the time use a different start of year (O.S.), or whether a date conforms to the ‘julian calendar’ (O.S.) rather than the ‘gregorian’ (N.S.))
(the ‘gregorian calendar’ continued to use the previous calendar era (‘year-numbering system’), which counts years from the traditional date of the ‘nativity’ (anno domini), originally calculated in the ‘6th century’ by ‘dionysius exiguus’)
(this ‘year-numbering system’ (also known as ‘dionysian era’ or ‘common era’) is the predominant international standard today)
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*👨🔬🕵️♀️🙇♀️*SKETCHES*🙇♂️👩🔬🕵️♂️*
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*“XXX”* ☞ 👉👉👉
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👈👈👈☜**THE “ANNO DOMINI” ERA* ☞ 👉👉👉
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💕💝💖💓🖤💙🖤💙🖤💙🖤❤️💚💛🧡❣️💞💔💘❣️🧡💛💚❤️🖤💜🖤💙🖤💙🖤💗💖💝💘
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*🌈✨ *TABLE OF CONTENTS* ✨🌷*
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🔥🔥🔥🔥🔥🔥*we won the war* 🔥🔥🔥🔥🔥🔥