Gregorian+Calendar



__//The Gregorian//__ __ //fata ibisevic// __

__ ‍‍‍‍‍‍‍‍‍﻿Description of the Gregorian Calendar __
 * It is an arithmetical calendar
 * It is the calendar accepted internationally
 * Also called the Christian or Western Calendar
 * Aloysius Lilius introduced the calendar, but it was mde offical by Pope Gregory XIII
 * The calendar is divided into twelve months
 * Days are counted as the basic unit of time, One Gregorian year has 365 or 366 days
 * Julian calendar is the reason for the development of Gregorian Calendar
 * Julian Calendar's leap years were modified by the Gregorian Calendar
 * 

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__The Gregorian Calendar Reform__
 * Since the Julian Calendar added a leap year, it caused the seasons to be off
 * It takes the earth 365.2425 days to go around the sun while a Julian year consisted of 365.25 days, this results in a difference of eleven minutes each year
 * The Catholic Church's main motivation in switching calendars was so they could celebrate Easter around the time when the First Council of Nicaea had agreed on and the error on the Julian Calendar didn't allow them to do that
 * <span style="color: #ff0000; display: block; font-family: 'arial black',gadget,sans-serif; text-align: center;">October 4, 1582 a Thursday was the last day of the Julian Calendar and the Gregorian Calendar began on October 15,1582 a Friday

<span style="background-color: #ffd370; color: #ff0000; font-family: 'Comic Sans MS',cursive; font-size: 130%;">The Calendar Reform has two stages : // First Stage : // <span style="color: #ff0000; font-family: 'Arial Black',Gadget,sans-serif;">They first chose 365.2425 as the correct length of a solar year since the tropical year was 365.24219 days which made it closer to the vernal equinox year

//Second Stage :// <span style="color: #ff0000; font-family: 'Arial Black',Gadget,sans-serif;">In this stage they made a model based on the approximation to provide an accurate calendar. Aloysius Lilius devised a formula which proposed an imposition of a leap day in 97 years than 400 and a ten day correction that reverted the drift

to 10 March 1700 || From 5 October 1582 to 28 Fbruary 1700 || 10 days || to 11 March 1800 || From 29 February 1700 to 28 February 1800 || 11 days || to 12 March 1900 || From 29 February 1800 to 28 February 1900 || 12 days || to 13 March 2100 || From 29 February 1900 to 28 February 2100 || 13 days || to 14 March 2200 || From 29 February 2100 to 28 February 2200 || 14 days ||
 * ~ Gregorian range || Julian range || Difference ||
 * From 15 October 1582
 * From 11 March 1700
 * From 12 March 1800
 * From 13 March 1900
 * From 14 March 2100



__<span style="font-family: 'Comic Sans MS',cursive;">Adopting the Gregorian Calendar __
 * <span style="color: #ff0000; display: block; font-family: 'arial black',gadget,sans-serif; text-align: center;">It was 1582 when the calendar started to be used
 * <span style="color: #ff0000; display: block; font-family: 'arial black',gadget,sans-serif; text-align: center;">Many countries didn't start using the calendar automiatically
 * <span style="color: #ff0000; display: block; font-family: 'arial black',gadget,sans-serif; text-align: center;">In 1923 most of the Eastern Orthodox churches switched to the Gregorian Calendar
 * <span style="color: #ff0000; display: block; font-family: 'arial black',gadget,sans-serif; text-align: center;">Since the Gregorian Calenar was a Catholic invention, many Non Catholic countries rejected it



<span style="background-color: #ffd370; color: #ff0000; font-family: 'Comic Sans MS',cursive; font-size: 310%;">__MLA__ <span style="background-color: #ffd370; color: #ff0000; font-family: 'Comic Sans MS',cursive; font-size: 310%;"> "Gregorian Calendar: Facts, Discussion Forum, and Encyclopedia Article." //AbsoluteAstronomy.com//. Web. 11 Oct. 2011. [].

"Gregorian Calendar - Simple English Wikipedia, the Free Encyclopedia." //Wikipedia//. Web. 11 Oct. 2011. <http://simple.wikipedia.org/wiki/Gregorian_calendar>.