Gregorian Calendar

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Contemporary calendar has began its existence in the cristian era, in 526, started by pope John I. The chronologist of the pope, Dionysius Exiguus, worked further on the calendar, especially concerning Easter.
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The '''Gregorian calendar''' is the calendar in contemporary use.
  
During the Middle Ages some problems were dscovered with the use of the Julian calendar: every century had 3 to 4 days to much days. In the sixteenth century the mistake reached 10 days. It is the reason of calendar reformation in 1582, by the pope Gregorius XIII. He decided that 4 October should be followed by 15 October at once. Also he decided that all of the leapyears of the full century years, which were not dividable by 400 would fall off. At this manner 1900 was not a leapyear, 2000 was a leapyear and 2100 will not.
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The modern calendar began its existence in the Christian era, in 526, started by [[Pope]] John I. The chronologist of the Pope, Dionysius Exiguus, worked further on the calendar, especially concerning [[Easter]].
  
The average duration of the Gregorian year is  so 365.2425 days. The diffirence with the real tropical year (365.2422) is so small, that a new reformation will be needed in very, very far future.
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During the Middle Ages, some problems were discovered with the use of the Julian calendar: every century had three to four days too many. In the sixteenth century the mistake grew to 10 days. Therefore, in 1582, it was decided that the calendar needed reform.  Pope Gregory XIII decreed that [[October 4]] should be followed by [[October 15]] at once. Also, he decided that all of the leap days of the full century years which were not dividable by 400 would be omitted. In this manner, 1900 was not a leap year, 2000 was a leap year, and 2100 will not be.
  
The Gregorian calendar was worked on by the Calabrian medicician Aloysius Lilius, as well as by the papal commissioner  C.Clavius, before it has reached the modern perfection.
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The average duration of the Gregorian year is 365.2425 days. The diffirence with the real tropical year (365.2422) is so small that a new reformation will be needed in very, very distant future.
  
The new calendar got in use very slowly:
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The Gregorian calendar was worked on by the Calabrian medicician Aloysius Lilius, as well as by the papal commissioner C. Clavius, before it reached the modern usage.
  
- England and colonies (Northern America) in 1752;
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The new calendar came into use very slowly:
- whole Germany in 1776;
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- Sweden 1823;
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* England and colonies (Northern America) in 1752;
- Russia in 1918 (the difference with Julian calendar was already 13 days!)
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* Germany (as a whole) in 1776;
- In The Netherlands the calendar took its start at diffirent stages, in diffirent provinces.
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* Sweden in 1823; and
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* Russia in 1918.
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* In The Netherlands the calendar took its start at different stages, in different provinces.

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The Gregorian calendar is the calendar in contemporary use.

The modern calendar began its existence in the Christian era, in 526, started by Pope John I. The chronologist of the Pope, Dionysius Exiguus, worked further on the calendar, especially concerning Easter.

During the Middle Ages, some problems were discovered with the use of the Julian calendar: every century had three to four days too many. In the sixteenth century the mistake grew to 10 days. Therefore, in 1582, it was decided that the calendar needed reform. Pope Gregory XIII decreed that October 4 should be followed by October 15 at once. Also, he decided that all of the leap days of the full century years which were not dividable by 400 would be omitted. In this manner, 1900 was not a leap year, 2000 was a leap year, and 2100 will not be.

The average duration of the Gregorian year is 365.2425 days. The diffirence with the real tropical year (365.2422) is so small that a new reformation will be needed in very, very distant future.

The Gregorian calendar was worked on by the Calabrian medicician Aloysius Lilius, as well as by the papal commissioner C. Clavius, before it reached the modern usage.

The new calendar came into use very slowly:

  • England and colonies (Northern America) in 1752;
  • Germany (as a whole) in 1776;
  • Sweden in 1823; and
  • Russia in 1918.
  • In The Netherlands the calendar took its start at different stages, in different provinces.
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