Dating systems ce

29 Apr

For instance, in the date AD 2001, the prefix "AD" stands for "Anno Domini" which is Latin for "the year of our Lord." Similarly, in the date 500 BC, the suffix "BC" stands for "Before Christ." In sixth century Europe, the concept of "zero" was still unknown. Furthermore, modern scholars believe Christ's birth was actually four years earlier than Exiguus thought.In spite of these deficiencies, the dating system devised by Exiguus is now too deeply ensconced in the Western world to easily change.This difference of 8 hours, 48 minutes, 36 seconds (which is almost equal to 11/30th of a day), by which the astronomical lunar year is the longer, is compensated by the intercalation of eleven days in every cycle of thirty years at the stated intervals.The most commonly used method of intercalation is to make years 2, 5, 7, 10, 13, 16, 18, 21, 24, 26 and 29 in the cycle into leap years, called kabisha.

Caliph Umar The Muslim year is purely lunar, consisting of twelve months containing, in alternate sequence, thirty and twenty-nine days.

left Makkah on the date corresponding to 16 July 622 CE in the Julian calendar and arrived at Madinah on 22 September 622 CE.

About seventeen years later, the Muslim calendar was introduced by the second Caliph, Umar ibn al-Khattab , who was faced with the practical problems of administering a rapidly expanding empire in which correspondence between distant places had to be accurately dated.

As a matter of fact, BC is written after the year number.

It is also grounded on the Julian or the Gregorian calendars.