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The terms anno Domini[a][1][2] (AD) and before Christ[b][3][4][5] (BC) are used to label or number years in the Julian and Gregorian calendars. The term anno Domini is Medieval Latin
Medieval Latin
and means "in the year of the Lord",[6] but is often presented using "our Lord" instead of "the Lord",[7][8] taken from the full original phrase "anno Domini nostri Jesu Christi", which translates to "in the year of our Lord Jesus
Jesus
Christ". This calendar era is based on the traditionally reckoned year of the conception or birth of Jesus
Jesus
of Nazareth, with AD counting years from the start of this epoch, and BC denoting years before the start of the era. There is no year zero in this scheme, so the year AD 1 immediately follows the year 1 BC. This dating system was devised in 525 by Dionysius Exiguus of Scythia Minor, but was not widely used until after 800.[9][10] The Gregorian calendar
Gregorian calendar
is the most widely used calendar in the world today. For decades, it has been the unofficial global standard, adopted in the pragmatic interests of international communication, transportation, and commercial integration, and recognized by international institutions such as the United Nations.[11] Traditionally, English followed Latin
Latin
usage by placing the "AD" abbreviation before the year number.[c] However, BC is placed after the year number (for example: AD 2018, but 68 BC), which also preserves syntactic order. The abbreviation is also widely used after the number of a century or millennium, as in "fourth century AD" or "second millennium AD" (although conservative usage formerly rejected such expressions).[13] Because BC is the English abbreviation for Before Christ, it is sometimes incorrectly concluded that AD means After Death, i.e., after the death of Jesus. However, this would mean that the approximate 33 years commonly associated with the life of Jesus
Jesus
would neither be included in the BC nor the AD time scales.[14] Terminology that is viewed by some as being more neutral and inclusive of non-Christian people is to call this the Current or Common Era (abbreviated as CE), with the preceding years referred to as Before the Common or Current Era (BCE). Astronomical year numbering and ISO 8601 avoid words or abbreviations related to Christianity, but use the same numbers for AD years.

Contents

1 History

1.1 Popularization 1.2 Change of year

2 Historical birth date of Jesus 3 Other eras 4 CE and BCE 5 No year zero / Start and end of a century 6 See also 7 Notes 8 References

8.1 Citations 8.2 Sources

9 External links

History[edit] The Anno Domini
Anno Domini
dating system was devised in 525 by Dionysius Exiguus to enumerate the years in his Easter
Easter
table. His system was to replace the Diocletian
Diocletian
era that had been used in an old Easter table
Easter table
because he did not wish to continue the memory of a tyrant who persecuted Christians.[15] The last year of the old table, Diocletian
Diocletian
247, was immediately followed by the first year of his table, AD 532. When he devised his table, Julian calendar
Julian calendar
years were identified by naming the consuls who held office that year—he himself stated that the "present year" was "the consulship of Probus Junior", which was 525 years "since the incarnation of our Lord Jesus
Jesus
Christ".[16] Thus Dionysius implied that Jesus' Incarnation occurred 525 years earlier, without stating the specific year during which his birth or conception occurred. "However, nowhere in his exposition of his table does Dionysius relate his epoch to any other dating system, whether consulate, Olympiad, year of the world, or regnal year of Augustus; much less does he explain or justify the underlying date."[17] Bonnie J. Blackburn and Leofranc Holford-Strevens briefly present arguments for 2 BC, 1 BC, or AD 1 as the year Dionysius intended for the Nativity or Incarnation. Among the sources of confusion are:[10]

In modern times, Incarnation is synonymous with the conception, but some ancient writers, such as Bede, considered Incarnation to be synonymous with the Nativity. The civil or consular year began on 1 January but the Diocletian
Diocletian
year began on 29 August (30 August in the year before a Julian leap year). There were inaccuracies in the lists of consuls. There were confused summations of emperors' regnal years.

It is not known how Dionysius established the year of Jesus's birth. Two major theories are that Dionysius based his calculation on the Gospel of Luke, which states that Jesus
Jesus
was "about thirty years old" shortly after "the fifteenth year of the reign of Tiberius Caesar", and hence subtracted thirty years from that date, or that Dionysius counted back 532 years from the first year of his new table.[18][19] It is convenient to initiate a calendar not from the very day of an event but from the beginning of a cycle which occurs in close proximity. For example, the Islamic calendar
Islamic calendar
begins not from the date of the Hijra, but rather weeks prior, on the first occurrence of the month of Muharram (corresponding to 16 July 622).[20] It has also been speculated by Georges Declercq[21] that Dionysius' desire to replace Diocletian
Diocletian
years with a calendar based on the incarnation of Christ was intended to prevent people from believing the imminent end of the world. At the time, it was believed by some that the Resurrection and end of the world would occur 500 years after the birth of Jesus. The old Anno Mundi
Anno Mundi
calendar theoretically commenced with the creation of the world based on information in the Old Testament. It was believed that, based on the Anno Mundi
Anno Mundi
calendar, Jesus
Jesus
was born in the year 5500 (or 5500 years after the world was created) with the year 6000 of the Anno Mundi
Anno Mundi
calendar marking the end of the world.[22][23] Anno Mundi
Anno Mundi
6000 (approximately AD 500) was thus equated with the resurrection and the end of the world[24] but this date had already passed in the time of Dionysius. Popularization[edit] The Anglo-Saxon historian the Venerable Bede, who was familiar with the work of Dionysius Exiguus, used Anno Domini
Anno Domini
dating in his Ecclesiastical History
History
of the English People, completed in 731. In this same history, he also used another Latin
Latin
term, ante vero incarnationis dominicae tempus anno sexagesimo ("in fact in the 60th year before the time of the Lord's incarnation"), equivalent to the English "before Christ", to identify years before the first year of this era.[25] Both Dionysius and Bede
Bede
regarded Anno Domini
Anno Domini
as beginning at the incarnation of Jesus, but "the distinction between Incarnation and Nativity was not drawn until the late 9th century, when in some places the Incarnation epoch was identified with Christ's conception, i.e., the Annunciation
Annunciation
on March 25" (Annunciation style).[26]

Statue of Charlemagne
Charlemagne
by Agostino Cornacchini
Agostino Cornacchini
(1725), at St. Peter's Basilica, Vatican City. Charlemagne
Charlemagne
promoted the usage of the Anno Domini epoch throughout the Carolingian Empire.

On the continent of Europe, Anno Domini
Anno Domini
was introduced as the era of choice of the Carolingian Renaissance
Carolingian Renaissance
by the English cleric and scholar Alcuin
Alcuin
in the late eighth century. Its endorsement by Emperor Charlemagne
Charlemagne
and his successors popularizing the use of the epoch and spreading it throughout the Carolingian Empire
Carolingian Empire
ultimately lies at the core of the system's prevalence. According to the Catholic Encyclopedia, popes continued to date documents according to regnal years for some time, but usage of AD gradually became more common in Roman Catholic
Roman Catholic
countries from the 11th to the 14th centuries.[27] In 1422, Portugal
Portugal
became the last Western European country to switch to the system begun by Dionysius.[28] Eastern Orthodox
Eastern Orthodox
countries only began to adopt AD instead of the Byzantine calendar
Byzantine calendar
in 1700 when Russia
Russia
did so, with others adopting it in the 19th and 20th centuries. Although Anno Domini
Anno Domini
was in widespread use by the 9th century, the term "Before Christ" (or its equivalent) did not become common until much later. Bede
Bede
the Venerable used the expression "anno igitur ante incarnationem Dominicam" (so in the year before the Incarnation of the Lord) twice. "Anno an xpi nativitate" (in the year before the birth of Christ) is found in 1474 in a work by a German monk.[29] In 1627, the French Jesuit
Jesuit
theologian Denis Pétau
Denis Pétau
(Dionysius Petavius in Latin), with his work De doctrina temporum, popularized the usage ante Christum ( Latin
Latin
for "Before Christ") to mark years prior to AD.[30][31][32] Change of year[edit] When the reckoning from Jesus' incarnation began replacing the previous dating systems in western Europe, various people chose different Christian feast days to begin the year: Christmas, Annunciation, or Easter. Thus, depending on the time and place, the year number changed on different days in the year, which created slightly different styles in chronology:[33]

From 25 March 753 AUC (today in 1 BC), i.e., notionally from the incarnation of Jesus. That first " Annunciation
Annunciation
style" appeared in Arles
Arles
at the end of the 9th century, then spread to Burgundy and northern Italy. It was not commonly used and was called calculus pisanus since it was adopted in Pisa
Pisa
and survived there till 1750. From 25 December 753 AUC (today in 1 BC), i.e., notionally from the birth of Jesus. It was called "Nativity style" and had been spread by the Venerable Bede
Bede
together with the Anno Domini
Anno Domini
in the early Middle Ages. That reckoning of the Year of Grace from Christmas
Christmas
was used in France, England and most of western Europe
Europe
(except Spain) until the 12th century (when it was replaced by Annunciation
Annunciation
style), and in Germany until the second quarter of the 13th century. From 25 March 754 AUC (today in AD 1). That second "Annunciation style" may have originated in Fleury Abbey
Fleury Abbey
in the early 11th century, but it was spread by the Cistercians. Florence
Florence
adopted that style in opposition to that of Pisa, so it got the name of calculus florentinus. It soon spread in France and also in England where it became common in the late 12th century and lasted until 1752. From Easter, starting in 754 AUC (AD 1). That mos gallicanus (French custom) bound to a moveable feast was introduced in France by king Philip Augustus (r. 1180–1223), maybe to establish a new style in the provinces reconquered from England. However, it never spread beyond the ruling élite.

With these various styles, the same day could, in some cases, be dated in 1099, 1100 or 1101. Historical birth date of Jesus[edit] See also: Date of birth of Jesus, Nativity of Jesus
Nativity of Jesus
§ Date of birth, and Chronology
Chronology
of Jesus
Jesus
§ Historical birth date of Jesus The date of birth of Jesus of Nazareth
Jesus of Nazareth
is not stated in the gospels or in any secular text, but most scholars assume a date of birth between 6 BC and 4 BC.[34] The historical evidence is too sketchy to allow a definitive dating,[35] but the date is estimated through two different approaches - one by analyzing references to known historical events mentioned in the Nativity accounts in the Gospels of Luke and Matthew, and the second by working backwards from the estimation of the start of the ministry of Jesus.[36][37] Other eras[edit] Further information: Calendar
Calendar
era During the first six centuries of what would come to be known as the Christian era, European countries used various systems to count years. Systems in use included consular dating, imperial regnal year dating, and Creation dating. Although the last non-imperial consul, Basilius, was appointed in 541 by Emperor Justinian I, later emperors through Constans II
Constans II
(641–668) were appointed consuls on the first 1 January after their accession. All of these emperors, except Justinian, used imperial post-consular years for the years of their reign, along with their regnal years.[38] Long unused, this practice was not formally abolished until Novell XCIV of the law code of Leo VI did so in 888. Another calculation had been developed by the Alexandrian monk Annianus around the year AD 400, placing the Annunciation
Annunciation
on 25 March AD 9 (Julian)—eight to ten years after the date that Dionysius was to imply. Although this incarnation was popular during the early centuries of the Byzantine Empire, years numbered from it, an Era of Incarnation, were exclusively used and are yet used, in Ethiopia. This accounts for the seven- or eight-year discrepancy between the Gregorian and Ethiopian calendars. Byzantine chroniclers like Maximus the Confessor, George Syncellus, and Theophanes dated their years from Annianus' creation of the world. This era, called Anno Mundi, "year of the world" (abbreviated AM), by modern scholars, began its first year on 25 March 5492 BC. Later Byzantine chroniclers used Anno Mundi
Anno Mundi
years from 1 September 5509 BC, the Byzantine Era. No single Anno Mundi epoch was dominant throughout the Christian world. Eusebius of Caesarea in his Chronicle used an era beginning with the birth of Abraham, dated in 2016 BC (AD 1 = 2017 Anno Abrahami).[39] Spain and Portugal
Portugal
continued to date by the Era of the Caesars or Spanish Era, which began counting from 38 BC, well into the Middle Ages. In 1422, Portugal
Portugal
became the last Catholic country to adopt the Anno Domini
Anno Domini
system.[27] The Era of Martyrs, which numbered years from the accession of Diocletian
Diocletian
in 284, who launched the last yet most severe persecution of Christians, was used by the Church of Alexandria
Alexandria
and is still used, officially, by the Coptic Orthodox and Coptic Catholic churches. It was also used by the Ethiopian church. Another system was to date from the crucifixion of Jesus
Jesus
Christ, which as early as Hippolytus and Tertullian
Tertullian
was believed to have occurred in the consulate of the Gemini (AD 29), which appears in some medieval manuscripts. CE and BCE[edit] Main article: Common Era Alternative names for the Anno Domini
Anno Domini
era include vulgaris aerae (found 1615 in Latin),[40] "Vulgar Era" (in English, as early as 1635),[41] "Christian Era" (in English, in 1652),[42] "Common Era" (in English, 1708),[43] and "Current Era".[44] Since 1856,[45] the alternative abbreviations CE and BCE, (sometimes written C.E. and B.C.E.) are sometimes used in place of AD and BC. The "Common/Current Era" ("CE") terminology is often preferred by those who desire a term that does not explicitly make religious references.[46][47] For example, Cunningham and Starr (1998) write that "B.C.E./C.E. …do not presuppose faith in Christ and hence are more appropriate for interfaith dialog than the conventional B.C./A.D."[48] Upon its foundation, the Republic of China
Republic of China
adopted the Minguo Era, but used the Western calendar for international purposes. The translated term was 西元 ("xī yuán", "Western Era"). Later, in 1949, the People's Republic of China
Republic of China
adopted 公元 (gōngyuán, "Common Era") for all purposes domestic and foreign. No year zero / Start and end of a century[edit] Further information: 0 (year), Astronomical year numbering, Millennium, and Century In the AD year numbering system, whether applied to the Julian or Gregorian calendars, AD 1 is preceded by 1 BC. There is no year "0" between them, so a new century begins in a year which has "01" as the final digits (e.g., 1801, 1901, 2001). New millennia likewise are considered to have begun in 1001 and 2001. This is at odds with the much more common conception that centuries and millennia begin when the trailing digits are zeroes (1800, 1900, 2000, etc.); for example, the worldwide celebration of the new millennium took place on New Year's Eve 1999, when the year number ticked over to 2000.[9] For computational reasons, astronomical year numbering and the ISO 8601 standard designate years so that AD 1 = year 1, 1 BC = year 0, 2 BC = year −1, etc.[d] In common usage, ancient dates are expressed in the Julian calendar, but ISO 8601 uses the Gregorian calendar
Gregorian calendar
and astronomers may use a variety of time scales depending on the application. Thus dates using the year 0 or negative years may require further investigation before being converted to BC or AD. See also[edit]

Ante Christum natum Calendar Common Era Holocene calendar

Notes[edit]

^ The word "anno" is often capitalized, but this is considered incorrect by many authorities and either not mentioned in major dictionaries or only listed as an alternative.'s manual of style also prescribes lowercase. ^ The word "before" is often capitalized, but this is considered incorrect by many authorities and either not mentioned in major dictionaries or only listed as an alternative.'s manual of style also prescribes lowercase. ^ This convention comes from grammatical usage. Anno 500 means "in the year 500"; anno domini 500 means "in the year 500 of Our Lord". Just as "500 in the year" is not good English syntax, neither is 500 AD; whereas "AD 500" preserves syntactic order when translated.[12] ^ To convert from a year BC to astronomical year numbering, reduce the absolute value of the year by 1, and prefix it with a negative sign (unless the result is zero). For years AD, omit the AD and prefix the number with a plus sign (plus sign is optional if it is clear from the context that the year is after the year 0).[49]

References[edit] Citations[edit]

^ "anno Domini". Collins English Dictionary.  ^ "anno Domini". American Heritage Dictionary. Houghton Mifflin Harcourt.  ^ "BC". Collins English Dictionary.  ^ "before Christ". American Heritage Dictionary. Houghton Mifflin Harcourt.  ^ "BC". Merriam Webster Online Dictionary.  ^ "Anno Domini". Merriam Webster Online Dictionary. Merriam-Webster. 2003. Retrieved 2011-10-04. Etymology: Medieval Latin, in the year of the Lord  ^ "Online Etymology Dictionary". Retrieved 2011-10-04.  ^ Blackburn & Holford-Strevens 2003, p. 782 "since AD stands for anno Domini, 'in the year of (Our) Lord'" ^ a b Teresi, Dick (July 1997). "Zero". The Atlantic.  ^ a b Blackburn & Holford-Strevens 2003, pp. 778–9. ^ Eastman, Allan. "A Month of Sundays". Date and Time. Archived from the original on 2010-05-06. Retrieved 2010-05-04.  ^ Chicago Manual of Style 2010, pp. 476–7; Goldstein 2007, p. 6. ^ Chicago Manual of Style, 1993, p. 304. ^ Donald P. Ryan, (2000), 15. ^ Blackburn & Holford-Strevens 2003, p. 767. ^ Nineteen year cycle of Dionysius Introduction and First Argumentum. ^ Blackburn & Holford-Strevens 2003, p. 778. ^ Tøndering, Claus, The Calendar
Calendar
FAQ: Counting years ^ Mosshammer, Alden A (2009). The Easter
Easter
Computus and the Origins of the Christian Era. Oxford. p. 347.  ^ F. A. Shamsi, "The Date of Hijrah", Islamic Studies 23 (1984): 189-224, 289-323 (JSTOR link 1 + JSTOR link 2). ^ Declercq, Georges, "Anno Domini. The Origins of the Christian Era" Turnhout, Belgium, 2000 ^ Wallraff, Martin: Julius Africanus und die Christliche Weltchronik. Walter de Gruyter, 2006 ^ Mosshammer, Alden A.: The Easter
Easter
Computus and the Origins of the Christian Era. Oxford University Press, 2009, p. 254, p. 270, p. 328 ^ Declercq, Georges: Anno Domini. The Origins of the Christian Era. Turnhout Belgium. 2000 ^ Bede
Bede
731, Book 1, Chapter 2, first sentence. ^ Blackburn & Holford-Strevens 2003, p. 881. ^ a b Patrick, 1908 ^ "General Chronology". New Advent Catholic Encyclopedia. Vol III. New York: Robert Appleton Company. 1908. Retrieved 2011-10-25.  ^ Werner Rolevinck in Fasciculus temporum (1474) used Anno an xpi nativitatem (in the ...(th) year before the birth of Christ) for all years between creation and Jesus. "xpi" is the Greek χρι in Latin letters, which is an abbreviation for Christi. This phrase appears upside down in the centre of recto folios (right hand pages). From Jesus
Jesus
to Pope
Pope
Sixtus IV he usually used Anno Christi or its abbreviated form Anno xpi (on verso folios—left hand pages). He used Anno mundi alongside all of these terms for all years. ^ Steel, Duncan (2000). Marking time: the epic quest to invent the perfect calendar. p. 114. ISBN 978-0-471-29827-4. Retrieved 2010-06-01.  ^ Hunt, Lynn Avery (2008). Measuring time, making history. p. 33. ISBN 978-963-9776-14-2. Retrieved 2010-06-01.  ^ Petau, Denis (1758). search for "ante Christum" in a 1748 reprint of a 1633 abridgement entitled Rationarium temporum by Denis Petau. Retrieved 2010-06-01.  ^ C. R. Cheney, A Handbook of Dates, for students of British history, Cambridge University Press, 1945–2000, pp. 8–14. ^ Dunn, James DG (2003). " Jesus
Jesus
Remembered". Eerdmans Publishing: 324.  ^ Doggett 1992, p579: "Although scholars generally believe that Christ was born some years before AD 1, the historical evidence is too sketchy to allow a definitive dating". ^ Paul L. Maier "The Date of the Nativity and Chronology
Chronology
of Jesus" in Chronos, kairos, Christos: nativity and chronological studies by Jerry Vardaman, Edwin M. Yamauchi 1989 ISBN 0-931464-50-1 pp. 113–129 ^ New Testament History
History
by Richard L. Niswonger 1992 ISBN 0-310-31201-9 pp. 121–124 ^ Roger S. Bagnall and Klaas A. Worp, Chronological Systems of Byzantine Egypt, Leiden, Brill, 2004. ^ Alfred von Gutschmid, Kleine Schriften, F. Ruehl, Leipzig, 1889, p.433. ^ Johannes Kepler
Johannes Kepler
(1615). Joannis Keppleri Eclogae chronicae: ex epistolis doctissimorum aliquot virorum & suis mutuis, quibus examinantur tempora nobilissima: 1. Herodis Herodiadumque, 2. baptismi & ministerii Christi annorum non plus 2 1/4, 3. passionis, mortis et resurrectionis Dn. N. Iesu Christi, anno aerae nostrae vulgaris 31. non, ut vulgo 33., 4. belli Iudaici, quo funerata fuit cum Ierosolymis & Templo Synagoga Iudaica, sublatumque Vetus Testamentum. Inter alia & commentarius in locum Epiphanii obscurissimum de cyclo veteri Iudaeorum. (in Latin). Francofurti : Tampach. Retrieved 2011-05-18. anno aerae nostrae vulgaris  ^ Kepler, Johann; Vlacq, Adriaan (1635). Ephemerides of the Celestiall Motions, for the Yeers of the Vulgar Era 1633... Retrieved 2011-05-18.  ^ Sliter, Robert (1652). A celestiall glasse, or, Ephemeris
Ephemeris
for the year of the Christian era 1652 being the bissextile or leap-year: contayning the lunations, planetary motions, configurations & ecclipses for this present year ... : with many other things very delightfull and necessary for most sorts of men: calculated exactly and composed for ... Rochester. London: Printed for the Company of Stationers.  ^ The History
History
of the Works of the Learned. 10. London: Printed for H. Rhodes. January 1708. p. 513. Retrieved 2011-05-18.  ^ BBC Team (8 February 2005). " History
History
of Judaism 63BCE–1086CE". BBC Religion & Ethics. British Broadcasting Corporation. Archived from the original on 2011-05-13. Retrieved 2011-05-18. Year 1: CE – What is nowadays called the 'Current Era' traditionally begins with the birth of a Jewish teacher called Jesus. His followers came to believe he was the promised Messiah and later split away from Judaism to found Christianity  ^ Raphall, Morris Jacob (1856). Post-Biblical History
History
of The Jews. Moss & Brother. Archived from the original on 11 May 2011. Retrieved 2011-05-18.  The term common era does not appear in this book; the term Christian era [lowercase] does appear a number of times. Nowhere in the book is the abbreviation explained or expanded directly. ^ Robinson, B.A. (20 April 2009). "Justification of the use of "CE" & "BCE" to identify dates. Trends". ReligiousTolerance.org.  ^ William Safire (17 August 1997). "On Language: B.C./A.D. or B.C.E./C.E.?". The New York Times Magazine.  ^ Cunningham, ed. by Philip A. (2004). Pondering the Passion : what's at stake for Christians and Jews?. Lanham, Md. [u.a.]: Rowman & Littlefield. p. 193. ISBN 978-0742532182. CS1 maint: Extra text: authors list (link) ^ Doggett, 1992, p. 579

Sources[edit]

Abate, Frank R. (ed.) (1997). Oxford Pocket Dictionary and Thesaurus (American ed.). New York: Oxford University Press. ISBN 0-19-513097-9. CS1 maint: Extra text: authors list (link) Goldstein, Norm, ed. (2007). Associated Press Style Book. New York: Basic Books. ISBN 0-465-00489-X.  Bede. (731). Historiam ecclesiasticam gentis Anglorum. Accessed 2007-12-07. Chicago Manual of Style (2nd ed.). University of Chicago. 1993. ISBN 0-226-10389-7.  Chicago Manual of Style (16th ed.). University of Chicago. 2010. ISBN 0-226-10420-6. 

Blackburn, Bonnie; Holford-Strevens, Leofranc (2003). The Oxford companion to the Year: An exploration of calendar customs and time-reckoning. Oxford University Press. ISBN 0-19-214231-3.  Corrected reprinting of original 1999 edition. Cunningham, Philip A; Starr, Arthur F (1998). Sharing Shalom: A Process for Local Interfaith Dialogue Between Christians and Jews. Paulist Press. ISBN 0-8091-3835-2.  Declercq, Georges (2000). Anno Domini: The origins of the Christian era. Turnhout: Brepols. ISBN 2-503-51050-7.  (despite beginning with 2, it is English) Declercq, G. " Dionysius Exiguus and the Introduction of the Christian Era". Sacris Erudiri 41 (2002): 165–246. An annotated version of part of Anno Domini. Doggett. (1992). "Calendars" (Ch. 12), in P. Kenneth Seidelmann (Ed.) Explanatory supplement to the astronomical almanac. Sausalito, CA: University Science Books. ISBN 0-935702-68-7. Patrick, J. (1908). "General Chronology". In The Catholic Encyclopedia. New York: Robert Appleton Company. Retrieved 2008-07-16 from New Advent: http://www.newadvent.org/cathen/03738a.htm Richards, E. G. (2000). Mapping Time. Oxford: Oxford University Press. ISBN 0-19-286205-7.  Riggs, John (January 2003). "Whatever happened to B.C. and A.D., and why?". United Church News. Retrieved 2005-12-19.  Ryan, Donald P. (2000). The Complete Idiot's Guide to Biblical Mysteries. Alpha Books. p. 15. ISBN 0-02-863831-X. 

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