Hawaii Sportsman
Would you like to react to this message? Create an account in a few clicks or log in to continue.

Gregorian calendar

Go down

Gregorian calendar Empty Gregorian calendar

Post  taixyz1992 Thu Dec 02, 2010 7:30 am

The Gregorian calendar, also known as the Western calendar or the Christian calendar, is the internationally accepted civil calendar.[1][2][3] It was introduced by Pope Gregory XIII, after whom the calendar was named, by a decree signed on 24 February 1582, a papal bull known by its opening words Inter gravissimas.[4] The reformed calendar was adopted later that year by a handful of countries, with other countries adopting it over the following centuries. The motivation for the Gregorian reform was that the Julian calendar assumes that the time between vernal equinoxes is 365.25 days, when in fact it is about 11 minutes less. The accumulated error between these values was about 10 days when the reform was made, resulting in the equinox occurring on March 11 and moving steadily earlier in the calendar. Since the equinox was tied to the celebration of Easter, the Roman Catholic Church considered that this steady movement was undesirable.

The Gregorian calendar reform contained two parts, a reform of the Julian calendar as used up to Pope Gregory's time, together with a reform of the lunar cycle used by the Church along with the Julian calendar for calculating dates of Easter. The reform was a modification of a proposal made by the Calabrian doctor Aloysius Lilius (or Lilio).[5] Lilius' proposal included reducing the number of leap years in four centuries from 100 to 97, by making 3 out of 4 centurial years common instead of leap years: this part of the proposal had been suggested before by, among others, Pietro Pitati. Lilio also produced an original and practical scheme for adjusting the epacts of the moon for completing the calculation of Easter dates, solving a long-standing difficulty that had faced proposers of calendar reform.

The Gregorian calendar continued the previous year-numbering system (Anno Domini), which counts years from the traditional Incarnation of Jesus, and which had spread throughout Europe during the Middle Ages. This year-numbering system is the predominant international standard today.

vibro stone columns
Business Name Generator

taixyz1992
big daddy boar
big daddy boar

Posts : 242
Join date : 2010-11-03

Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum