# Calendar Gregory

##### Article

August 13, 2022

The Gregorian Calendar or Gregorian Calendar is the calendar that is now the most widely used in the Western World. This is a modification of the Julius Calendar. The first to propose it was Dr. Aloysius Lilius of Naples-Italy, and approved by Pope Gregory XIII, on February 24, 1582. The calendar year is based on the Common Era. This calendar was created because the Julius Calendar was considered less accurate, because the beginning of spring (March 21) was advancing so that the Easter celebration that had been agreed upon since the First Council of Nicaea in 325 was no longer correct. Then in 1582, Thursday-4 October followed by Friday-15 October.

## Difference with Julius Calendar

A year in the Julian calendar lasts 365 days and 6 hours. But because the Earth's revolution only lasts 365 days 5 hours 48 minutes 46 seconds, then every 1 millennium, the Julius Calendar is 7 to 8 days behind (11 minutes 14 seconds per year). This problem is solved with slightly different leap days on this new calendar. On the Julian calendar, any year that is divisible by 4 is a leap year. However, on the Gregorian calendar, years with multiples of 100 are considered leap years if they are also divisible by 400. For example, years 1600, 2000, and 2400 are leap years, while 1500, 1700, 1800, 1900, and 2100 are not leap years. .

## Problem

After the Gregorian Calendar was introduced, not all countries wanted to use it. Only a few centuries after this, almost all western countries are willing to implement it. Russia only implemented it in 1918. Thus the Russian Communist Revolution, which is now commemorated every November 7, is referred to as the October Revolution. The Orthodox Church is still using the Julius Calendar. The Republic of Venice, Spain, Portugal, the Netherlands, Germany and Poland were the first countries to officially implement this calendar system through Inter gravissimas. in 1582. January 1, 1622 was designated as the beginning of the year. Previously the date of the new year in each European country in various circumstances.

## Moon

Each year is divided into 12 months: