Who is accredited with establishing the universal time line BC/AD and what year was it established?
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The Anno Domini system was developed by a Scythian monk named Dionysius Exiguus in Rome in 525, as an outcome of his work on calculating the date of Easter. Byzantine chroniclers like Theophanes continued to date each year in their world chronicles on a different Judaeo-Christian basis — from the notional creation of the World as calculated by Christian scholars in the first five centuries of the Christian era. These eras, sometimes called Anno Mundi, "year of the world" (abbreviated AM), by modern scholars, had their own disagreements. No single Anno Mundi epoch was dominant. One popular formulation was that established by Eusebius of Caesarea, a historian at the time of Constantine I. The Latin translator Jerome helped popularize Eusebius's AM count in the West. Another formulation, dominant in the East during the early centuries of the Byzantine Empire, was developed by the Alexandrian monk Anninus.\n\nAnno Domini (Latin: "In the Year of the Lord"), abbreviated as AD or A.D., defines an epoch based on the traditionally-reckoned year of the birth of Jesus of Nazareth. Similarly, Before Christ, abbreviated as BC or B.C., is used in the English language to denote years before the start of this epoch.\n\nThe designation is used to number years in the Christian Era, conventionally used with the Julian and Gregorian calendars. More descriptively, years may be also specified as Anno Domini Nostri Iesu Christi ("In the Year of Our Lord Jesus Christ").\n\nThe numbering of years per the Christian era is currently dominant all around the world in both commercial and scientific use. Presently, it is the common international standard, recognised by international institutions such as the United Nations and the Universal Postal Union. This is due both to tradition and to the fact that the solar Gregorian calendar has for a long time been considered to be astronomically correct.[1]\n\nIn English, usage copies Latin by placing the abbreviation before the year number for AD, but after the year number for BC; for example: 64 BC, but AD 2006.\n\nThe first historian or chronicler to use Anno Domini as his primary dating mechanism was Victor of Tonnenna, an African chronicler of the seventh century. A few generations later, the Anglo-Saxon historian Bede, who was familiar with the work of Dionysius, also used Anno Domini dating in his Ecclesiastical History of the English People, finished in 731. In this same history, he was the first to use the Latin equivalent of before Christ and established the standard for historians of no year zero, even though he used zero in his computus. Both Dionysius and Bede regarded Anno Domini as beginning at the incarnation, or conception, of Jesus, not his birth approximately nine months later (Annunciation style).\n\nOn the continent of Europe, Anno Domini was introduced as the era of choice of the Carolingian Renaissance by Alcuin. This endorsement by Charlemagne and his successors popularizing the usage of the epoch and spreading it throughout the Carolingian Empire ultimately lies at the core of the system's prevalence until present times.\n\nOutside the Carolingian Empire, Spain continued to date by the Era of the Caesars, or Spanish Era, well into the Middle Ages, which counted beginning with 38 BC. The Era of Martyrs, which numbered years from the accession of Diocletian in 284, who launched the last yet most severe persecution of Christians, prevailed in the East and is still used officially by the Coptic and used to be used by the Ethiopian church. Another system was to date from the crucifixion of Jesus Christ, which as early as Hippolytus and Tertullian was believed to have occurred in the consulate of the Gemini (AD 29), which appears in the occasional medieval manuscript.\n\nEven though Anno Domini was in widespread use by the ninth century, Before Christ (or its equivalent) did not become widespread until the late fifteenth century.
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The Anno Domini (B.C. and A.D) system was developed by a monk named Dionysius Exiguus (born in Scythia Minor) in Rome in 525, as an outcome of his work on calculating the date of Easter. \n\nEarly Christians designated the year via a combination of consular dating, imperial regnal year dating, and Creation dating. Use of consular dating ended when the emperor Justinian I discontinued appointing consuls in the mid sixth century, requiring the use of imperial regnal dating shortly thereafter. The last consul nominated was Anicius Faustus Albinus Basilius in 541. The papacy was in regular contact throughout the Middle Ages with envoys of the Byzantine world, and had a clear idea — sudden deaths and deposals notwithstanding — of who was the Byzantine emperor at any one time.\n\nAmong the sources of confusion mentioned by Blackburn & Holford-Strevens (2003, 778–779) are:\n\n    * In modern times Incarnation is synonymous with conception, but some ancient writers, such as Bede, considered Incarnation to be synonymous with the Nativity\n    * The civil, or consular year began on 1 January but the Diocletian year began on 29 August\n    * There were inaccuracies in the list of consuls\n    * There were confused summations of emperors' regnal years\n\nThe wikipedia link I've given you also gives citations for support each of the items I posted.
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I don't know who...but I can answer why. It is a simple matter of history. There was a dscision to define periods of history...BC...now BCE (for Before Christian Era) is an arbitrary division...\nAnd don't think this happened in the year Zero...it happened much later. \nThink of it this way...its like a book shelf that you are putting in order...this way you know where to history books are...the cook books..etc. Now you know if it happened before or after Christ's birth.\nWhy Christ? Cause this is a western calander system...in the far east they use a different calander with different time.  Hope this helps\n\n\noh and AD is latin...for in the Year of Our Lord
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May 10, 1954\n\nhttp://www.britannica.com/eb/article-9343590?tocId=9343590
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Since no one can understand this jumbed question I wil just answer another one:\n\nQ: "What is the international date line and why is it where it is?"\n\nA: "Learn how to type you jack@ss."
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I went to: http://www.humorsphere.com/confucius/quotes.htm\nTimeline for Confucius was 551-479 BC.
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1991, I believe, but it has been updated, clarified, and amended since then.\n\nGoogle the entire term for more info.
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The 22nd century starts in the year 2100\n\nSome would argue that as there was no Year 0 the first century started in 1 AD and was only 99 years long instead of 100 years long. And therefore all subsequent centuries should start in 101, 201 ... 2001, 2101.\n\nI don't agree with that point of view but it exists.
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June 1, 1968\n\nhttp://www.rnib.org.uk/xpedio/groups/public/documents/publicwebsite/public_keller.hcsp
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13th November 1945\n\nhttp://www.un.org/Overview/unmember.html
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You can try this:\n\nhttp://www.timelines.info/history/continents_and_countries/middle_east_and_asia/middle_east/israel/ancient_israel/
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Emperor Augustus.\n\nThe link below has plenty of interesting information on the Emperor.
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approx 325 BC\n\nhttp://en.wikipedia.org/wiki/Euclid
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Astrology is the oldest of the academic subjects and has been practiced - with almost no changes - for more than 8000 years. They roots can be found in Mesopotamia and cities like Babylon and Ur were early centres. Wise men and priests studied the sky and the Universe very thoroughly and came eventually to their conclusions. They were the same people who also invented our time system, with 24 hours of 60 minutes, divided into 60 seconds. Greeks and Romans followed much later and adopted the Mesopotamian system, which had already been in use with the Egyptians, Sumerians and other nations. In fact there is no civilisation that has not developed her own form of Astrology or adopted an existing one.\nBesides the Mesopotamian (or Western) system, the other main system is the Chinese (or Eastern). While the Western zodiac has twelve signs dividing the year, the Eastern gives a whole year to each of the twelve signs.\nApart from that, the general principles are quite similar, and the findings of a person's Eastern horoscope do not contradict the findings of the same person's Western horoscope.
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George Washington (February 22, 1732 – December 14, 1799) \n\nhttp://en.wikiquote.org/wiki/George_Washington
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The Universal Postal Union, an agency of the United Nations, coordinates the worldwide postal system.  Originally, UPU policies required that the sending country retain the postage, however, in 1969 a system that divided the postal revenues between two countries according to the difference in the total weight of mail took effect.
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Try reading about it here. the western empire fell in 476AD, and the eastern fell in 1453