October 4, 1582, sponsored by Pope Gregory XIII, at midnight of this day, a calendar reform will come into force

On a day like today (October 4), 1582, sponsored by Pope Gregory XIII, at midnight on this day, a calendar reform will come into force.
The Gregorian calendar is the calendar used in most part of the world. It was introduced in October 1582 by Pope Gregory XIII as a minor modification of the Julian calendar, reducing the average year from 365.25 days to 365.2425 days, and adjusting for the drift in the 'tropical' or 'solar' year that the inaccuracy had caused during the intervening centuries.
The calendar spaces out leap years to make its average year 365.2425 days long, approximating the tropical year of 365.2422 days which is determined by the revolution of the Earth around the Sun.

The rule for leap years is:

Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100, but these century 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 years 1600 and 2000.

There were two reasons for establishing the Gregorian calendar:
First, the Julian calendar incorrectly assumed that the average solar year is exactly 365.25 days long, an overestimate of just under one day per century. The Gregorian reform shortened the mean (calendar) year by 0.0075 days to stop the calendar drifting with respect to the equinoxes .
In second, in the years since the First Council of Nicaea in AD 325, the excess of leap days introduced by the Julian algorithm had caused the calendar drifted such that vernal (northern) equinox occurred well before its nominal date of March 21.
The adoption of the Gregorian Calendar was an event in the modern history of most cultures and societies, marking a change from their traditional dating system (or from old style) to the modern (or from new style) dating system that is widely used around the world today. . Some states adopted the new calendar beginning in 1582, some did not before the early 20th century, and others at various dates in between; however, some continue to use a different civil calendar.
How curious to comment that the countries that have not adopted the Gregorian calendar are Ethiopia (Ethiopian calendar), Nepal (Vikram Samvat), Iran and Afghanistan (Hijri solar calendar).
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- see you tomorrow
- see you tomorrow the 5th!
- right?
- won't we see each other tomorrow?
- then?
- tomorrow will not be 5
- how?
- change the calendar
- cannot be
- so I can't be calm
- you see
- I also have OCD
- go
- Who robbed me on October 5!
- quiet
- Where is the 5th of October!
- calm
- aaaaaaggggghhhhhhh... he won't be on October 5th.... aggggg

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