why do we use the gregorian calendar

The Gregorian calendar was the idea of Pope Gregory XIII. PThe calendar was named after Pope Gregory XIII. PThe calendar's initial introduction occurred in the 16th century, in the year 1582. PPrior to the adoption of the Gregorian calendar, European nations used the Julian calendar. PThis calendar was introduced under Julius Caesar. PThis calendar had certain errors. PFor example, a miscalculation caused the calendar to not be consistently aligned with the seasons. Pope Gregory XIII thought that it was important for Easter to be at around the same time every year.

PThe Council of Nicea had occurred in the springtime, and it was recorded that Easter had taken place close to this event. P
The Gregorian calendar was first adopted in Catholic nations. PPredominantly Protestant nations were slower to adopt the Gregorian calendar, though they did so eventually. PWhen Great Britain adopted the Gregorian calendar in 1752, eleven calendar days were lost. P Gregorian calendar, also called New Style Calendar, solar system now in general use. It was proclaimed in 1582 by Pope.

The Julian calendar year of 365. 25 days was too long, since the correct value for the tropical year isБ By the Julian reckoning, the solar days; the Б every four years was intended to maintain correspondence between the calendar and the seasons. A slight inaccuracy in the (the solar year more precisely 365 days, 5 hours, 48 minutes, 45. 25 seconds) caused the calendar dates of the seasons to regress almost one day per century. Although this regression had amounted to 14 days by Pope GregoryБs time, he based his reform on restoration of the, then falling on March 11, to the date (March 21) it had in 325, the time of the, and not on the date of the equinox at the time of the birth of, when it fell on March 25.

The change was effected by advancing the calendar 10 days after Oct. 4, 1582, the day following being reckoned as October 15. The Gregorian calendar differs from the Julian only in that no century year is a unless it is exactly divisible by 400 ( e. g. , 1600, 2000). A further proposed refinement, the of years evenly divisible by 4,000 as common (not leap) years, will keep the Gregorian calendar accurate to within one day in 20,000 years.

Within a year the change had been adopted by the Italian states, Portugal, Spain, and the German Catholic states. Gradually, other nations adopted the Gregorian calendar: the Protestant German states in 1699; England and its colonies in 1752; Sweden in 1753; Japan in 1873; China in 1912; the in 1918; and Greece in 1923. Islamic countries tend to retain calendars based on Islam ( see ).

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