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A chronology of Jesus aims to establish a timeline for some of the events of the life of Jesus in the four canonical gospels. The Christian gospels were primarily written as theological documents rather than historical chronicles and their authors showed little interest in an absolute chronology of Jesus. However, it is possible to correlate the New Testament with non-Christian sources such as Jewish and Greco-Roman documents to estimate specific date ranges for the major events in Jesus' life.
Two independent approaches can be used to estimate the year of birth of Jesus, one based on the nativity accounts in the gospels, the other by working backwards from the date of the start of his ministry. Most scholars assume a date of birth between 6 and 4 BC. Three independent approaches to estimate the dates of the ministry of Jesus are: first, the fifteenth year of the reign of Tiberius Caesar, second: the date of the building of the Jerusalem Temple and third, the date of the death of John the Baptist. Scholars generally estimate that the ministry of Jesus began around 27-29 AD and lasted at least one year, and perhaps three years, or more.
Diverse approaches have been used to estimate the date of the crucifixion of Jesus. One approach uses the attestations of non-Christian sources such as Josephus and Tacitus. Another method works backwards from the historically well established trial of Apostle Paul in Achaea to estimate the date of his conversion. Scholars generally agree that Jesus died between 30-36 AD.
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The Christian gospels were written as theological documents in the context of early Christianity rather than historical chronicles and their authors showed little interest in an absolute chronology of Jesus or in synchronizing the episodes of his life with the secular history of the age. One manifestation of the gospels being theological documents rather than historical chronicles is that they devote about one third of their text to just seven days, namely the last week of the life of Jesus in Jerusalem.
Although the gospels do not provide enough details regarding exact dates, it is possible to draw from them a general picture of the life story of Jesus and to establish some date ranges regarding the major events in his life via correlations with non-Christian sources. A number of historical non-Christian documents, such as Jewish and Greco-Roman sources, have been used in historical analyses of the existence of Jesus and his chronology. Virtually all modern historians agree that Jesus existed, and regard his baptism and his crucifixion as historical events, and assume that approximate ranges for these events can be estimated. However, as stated in John 21:25 the gospels do not claim to provide an exhaustive list of the events in the life of Jesus.
The year of birth of Jesus can be estimated using two independent approaches: one based on the nativity accounts in the gospels of Matthew and Luke, the other by working backwards from the date of the start of his ministry, when according to the Gospel of Luke he was about thirty years old. Most scholars assume a date of birth between 6 and 4 BC.
Three independent approaches have been used to estimate the dates of the ministry of Jesus. One method relies on Luke 3:1-2's statement that the ministry of John the Baptist (which preceded that of Jesus) started in the fifteenth year of the reign of Tiberius Caesar. Another approach is to correlate John 2:20's statement about the Jerusalem Temple being in construction for 46 years with the date of the building of the Second Temple. A third method uses the date of the death of John the Baptist based on the writings of Josephus, and correlates it to Matthew 14:4. Scholars generally estimate that the ministry of Jesus began around 27-29 AD and lasted one to three years.
A number of approaches have been used to estimate the date of the crucifixion of Jesus. One approach uses the attestations of non-Christian sources such as Josephus and Tacitus. Another approach works backwards from the historically well established trial of Apostle Paul in Corinth to estimate the date of his conversion, given that in the New Testament accounts this takes place after the death of Jesus.
Astronomical calculations have also been suggested as a method for establishing the date of the crucifixion. One method attempts to establish the date on which the Passover would have fallen on a Friday in the Hebrew calendar.
The two major, and independent, approaches to estimating the year of the birth of Jesus combine the accounts given in some of the Canonical gospels with non-biblical historical data to arrive at a date range, as discussed in the two sub-sections below. There are a wide range of more speculative theories, and some are discussed at the end of this article in the "other approaches" section.
The nativity-based approach to estimating the year of birth of Jesus relies on the analysis of the nativity accounts in the Gospels of Luke and Matthew along with other corresponding historical data.
Most mainstream scholars do not see the Luke and Matthew nativity stories as historically factual. Karl Rahner states that the authors of the gospels generally focus on theological elements rather than historical chronologies. However, both Luke and Matthew associate Jesus' birth with the time of Herod the Great.
Herod the Great is generally believed to have died around 4 BC, implying that the birth of Jesus was not after that year. Matthew 2:1 states that "Jesus was born in Bethlehem of Judaea in the days of Herod the king" and Luke 1:5 mentions the reign of Herod shortly before the birth of Jesus. The Matthew account implies that Jesus could have been as much as two years old at the time of the visit of the Magi, before Herod's death.
Scholars have attempted to address the contradiction between the two accounts, in that Luke places the birth of Jesus during the Census of Quirinius, which took place in 6 AD, although Matthew states the conception took place during the reign of King Herod — at least 10 years earlier. Most scholars believe Luke made an error in referring to the census, but some have attempted to reconcile this account with that of Matthew, from alternative translations of the Greek word prōtē used by Luke ("before" the census, rather than "the first" census) to suggestions that the census was performed in two stages, involving an earlier registration. 
The ministry-based approach to estimating the year of birth is independent of the nativity accounts, and works backwards from when Jesus began preaching, based on the statement in Luke 3:23 that he was "about 30 years of age" at that time.
The section below discusses three independent approaches to estimating this: first by using the "fifteenth year of the reign of Tiberius" in Luke 3:1-2, second via the reference in the dispute of Jesus and the Pharisees in John 2:20 ("“This temple has been under construction for forty-six years, and will you raise it up in three days?” ") and third by the reference of Flavius Josephus to the imprisonment and execution (Ant 18.5.2) of John the Baptist by Herod Antipas.
The third reference (i.e. the execution of the Baptist in Matthew 14:6-12) relates to a time when Jesus had already started preaching but the other two references relate to when he began.
The generally assumed date range for when John the Baptist was active, based on the reference to the reign of Tiberius in Luke 3:1-2, is from about 28-29 AD, with the preaching of Jesus following shortly thereafter. As discussed in the section below, based on the reference in John 2:13 to the Temple being in its 46th year of construction, scholarly estimates for Jesus' Temple visit in John 2:20 are around 27-29 AD, when Jesus was "about thirty years of age".
One method for the estimation of the date of the beginning of the ministry of Jesus is based on the Gospel of Luke's specific statement in Luke 3:1-2 about the ministry of John the Baptist which preceded that of Jesus:
Now in the fifteenth year of the reign of Tiberius Caesar, Pontius Pilate being governor of Judaea, and Herod being tetrarch of Galilee, and his brother Philip tetrarch of the region of Ituraea and Trachonitis, and Lysanias tetrarch of Abilene, in the highpriesthood of Annas and Caiaphas, the word of God came unto John the son of Zacharias in the wilderness.
There are, however, two approaches to determining when the reign of Tiberius Caesar started. The traditional approach is that of assuming that the reign of Tiberius started when he became co-regent in 11AD, placing the start of the ministry of John the Baptist around 26 AD. However, some scholars assume it to be upon the death of his predecessor Augustus Caesar in 14 AD, implying that the ministry of John the Baptist began in 29 AD.
The New Testament presents John the Baptist's ministry as the precursor to that of Jesus and the Baptism of Jesus as marking the beginning of Jesus' ministry. In his sermon in Acts 10:37-38, delivered in the house of Cornelius the centurion, Apostle Peter gives an overview of the ministry of Jesus, and refers to what had happened "throughout all Judaea, beginning from Galilee, after the baptism which John preached" and that Jesus had then gone about "doing good".
The generally assumed dates for the start of the ministry of John the Baptist based on this reference in the Gospel of Luke are about 28-29 AD, with the ministry of Jesus following it shortly thereafter.
One method for estimating the start of the ministry of Jesus without reliance on the Synoptic gospels is to relate the information in the Gospel of John (2:13 and 2:20) about the visit of Jesus to Herod's Temple in Jerusalem with historical data outside the gospels about dates of the construction of the Temple.
John 2:13 states that Jesus went to the Temple in Jerusalem around the start of his ministry and in John 2:20 Jesus is told: "This temple has been under construction for forty-six years, and will you raise it up in three days?".
Herod's Temple in Jerusalem was an extensive and long term construction on the Temple Mount, with worship and religious rituals performed during the multi-decade building process, which was never fully completed, not even by the time that the Temple was destroyed by the Romans in 70AD. Having built entire cities such as Caesarea Maritima, Herod saw the construction of the Temple as a key, colossal monument. The dedication of the initial temple (sometimes called the inner Temple) followed an 17 or 18 month construction period, just after the visit of Augustus to Syria.
Josephus (Ant 15.11.1) states that the temple's reconstruction was started by Herod in the 18th year of his reign. But there is some uncertainty about how Josephus referred to and computed dates, which event marked the start of Herod's reign, and whether the initial date should refer to the inner Temple, or the subsequent construction. Hence various scholars arrive at slightly different dates for the exact date of the start of the Temple construction, varying by a few years in their final estimation of the date of the Temple visit. Given that it took 46 years of construction, scholarly estimates for the Temple visit in the Gospel of John are around 27-29 AD.
In the Antiquities of the Jews, first century historian Flavius Josephus refers to the imprisonment and execution of John the Baptist by Herod Antipas and that Herodias left her husband to marry Herod Antipas, in defiance of Jewish law.
Scholars view Josephus' accounts of John the Baptist as authentic. His reference to the marriage of Herod and Herodias, which is also mentioned in the gospels, establishes a key connection with the episodes that appear there.
However, although both the gospels and Josephus refer to Herod Antipas killing John the Baptist, they differ on the details and motives, e.g. whether this act was a consequence of the marriage of Herod Antipas and Herodias (as indicated in Matthew 14:4, Mark 6:18), or a pre-emptive measure by Herod which possibly took place before the marriage to quell a possible uprising based on the remarks of John, as Josephus suggests in Ant 18.5.2.
The exact year of the marriage of Herod Antipas and Herodias is subject to debate among scholars. While some scholars place the year of the marriage in the range 27-31AD, others have approximated a date as late as AD 35, although such a late date has much less support. In his analysis of Herod's life, Harold Hoehner estimates that John the Baptist's imprisonment probably occurred around AD 30-31. The International Standard Bible Encyclopedia estimates the death of the Baptist to have occurred about AD 31-32.
Josephus stated (Ant 18.5.2) that the AD 36 defeat of Herod Antipas in the conflicts with Aretas IV of Nabatea was widely considered by the Jews of the time as misfortune brought about by Herod's unjust execution of John the Baptist. Given that John the Baptist was executed before the defeat of Herod by Aretas, and based on the scholarly estimates for the approximate date of the marriage of Herod Antipas and Herodias, the last part of the ministry of John the Baptist and hence parts of the ministry of Jesus fall within the historical time span of AD 28-35, with the later year 35 having the least support among scholars.
In the Antiquities of the Jews (written about 93 AD) Josephus, states (Ant 18.3) that Jesus was crucified on the orders of Pilate. Most scholars agree that while this reference includes some later Christian interpolations, it originally included a reference to the execution of Jesus under Pilate.
In the second century the Roman historian Tacitus in The Annals (c. 116 AD), described the persecution of Christians by Nero and stated (Annals 15.44) that Jesus had been executed on the orders of Pilate, a reference generally considered genuine, and of value as an independent source.
In the Gospel of Luke, while Jesus is in Pilate's court, Pilate realizes that Jesus is a Galilean and thus is under the jurisdiction of Herod Antipas. Given that Herod was in Jerusalem at that time, Pilate decided to send Jesus to Herod to be tried.
This episode is only described in the Gospel of Luke (23:7-15). While some scholars have questioned the authenticity of this episode, given that it is unique to the Gospel of Luke, the International Standard Bible Encyclopedia states that it fits well with the theme of the gospel.
Herod Antipas, a son of Herod the Great, was born before 20 BC and was exiled in the summer of 39 AD following a lengthy intrigue involving Caligula and Agrippa I, the grandson of his father. Although this episode provides a wider range date for the death of Jesus, it is in concord with the other estimates in that it indicates that Jesus' death took place before 39 AD.
Another approach to estimating an upper bound for the year of death of Jesus is the estimation of the date of Conversion of Paul the Apostle which the New Testament accounts place some time after the death of Jesus. Paul's conversion is discussed in both the Letters of Paul and in the Acts of the Apostles.
In the First Epistle to the Corinthians (15:3-8), Paul refers to his conversion. The Acts of the Apostles includes three separate references to his conversion experience, in Acts 9, Acts 22 and Acts 26.
Estimating the year of Paul's conversion relies on working backwards from his trial before Junius Gallio in Achaea Greece (Acts 18:12-17) around 51-52 AD, a date which gained historical credibility early in the 20th century following the discovery of four stone fragments as part of the Delphi Inscriptions, at Delphi across the Gulf from Corinth.
Most historians estimate that Gallio (brother of Seneca the Younger) became proconsul between the spring of 51 AD and the summer of 52 AD, and that his position ended no later than 53 AD. However, the trial of Paul is generally assumed to be in the earlier part of Gallio's tenure, based on the reference (Acts 18:2) to his meeting in Corinth with Priscilla and Aquila, who had been recently expelled from Rome based on Emperor Claudius' expulsion of some Jews from Rome, which is dated to 49-50 AD.
According to the New Testament, Paul spent eighteen months in Corinth, approximately seventeen years after his conversion. Galatians 2:1-10 states that Paul went back to Jerusalem fourteen years after his conversion, and various missions (at times with Barnabas) such as those in Acts 11:25-26 and 2 Corinthians 11:23-33 appear in the Book of Acts. The generally accepted scholarly estimate for the date of conversion of Paul is 33-36 AD, placing the death of Jesus before this date range.
One possible approach to dating the death of Jesus is by using astronomical evidence to establish the dates of Passover. The difficulty here is that the Jewish calendar was based not on astronomical calculation but on observation. It is possible to establish whether the moon was visible on a particular day but not whether it was actually sighted., As E. P. Sanders has pointed out, we cannot recreate local atmospheric conditions of two thousand years ago: "the synoptic chronology cannot be confirmed by astronomy, but neither can it be disproved". Nevertheless, some writers such as astronomer Colin Humphreys have attempted to confirm the crucifixion date using this method, obtaining 3 April 33 or 1 April 33.
In 1733, Isaac Newton estimated the date of the crucifixion by calculating the relative visibility of the crescent of the new moon. In Observations upon the Prophecies of Daniel Assuming that the crucifixion took place on Friday, 14 Nisan, and based on the fact that this date always fell on the full moon next after the vernal Equinox, it must have taken place on 23 April, AD 34. Newton narrowed the possible years to AD 33 and 34 and selected the latter by using a 'postponement rule' from the Hebrew calendar.
Later scientists used similar methods of relating the Hebrew and Julian calendars, with the version developed by J. K. Fotheringham becoming a standard by the middle of the 20th century. Fotheringham narrowed the possible dates to 7 April, AD 30 and 3 April, AD 33. He favored the latter date on the basis of its coincidence with a lunar eclipse (see below).
J. P. Pratt argued that Newton's reasoning was effectively sound but was mistaken in using the "postponement rule" from the modern Hebrew calendar, which was not in use at the time. He argued for AD 33 as the correct date.
The nativity accounts in the New Testament gospels of Matthew and Luke do not mention a day for the birth of Jesus. Karl Rahner states that given that the gospels were written as theological documents they do not pay attention to such details. Scholars such as E.P. Sanders consider the birth narratives non-historical and not a reliable method for determining the day of birth.
Neither gospel account mentions what time of year the birth took place. The Gospel of Luke reference to shepherds grazing their sheep in the fields implies a birth during the springtime, summer or early fall.
The day of birth of Jesus, celebrated as Christmas, is based on a feast rather than historical analysis. In the 1st and 2nd centuries, the Lord's Day (Sunday) was the earliest Christian celebration and included a number of theological themes. In the 2nd century, the Resurrection of Jesus became a separate feast as Easter and in the same century Epiphany began to be celebrated in the Churches of the East on 6 January. The festival of the Nativity which later turned into Christmas was a 4th-century feast in the Western Church notably in Rome and North Africa, although it is uncertain exactly where and when it was first celebrated.
The earliest source stating 25 December as the date of birth of Jesus is likely by Hippolytus of Rome, written very early in the 3rd century, based on the assumption that the conception of Jesus took place at the Spring equinox which he placed on March 25, and then added 9th months - festivals on that date were then celebrated. John Chrysostom also argued for a 25 December date in the late 4th century, basing his argument on the assumption that the offering of incense in Luke 1:8-11 was the offering of incense by a high priest on Yom Kippur (early October), and, as above, counting fifteen months forward. However, this was very likely a retrospective justification of a choice already made rather than a genuine attempt to derive the correct birth date.
In the Synoptic Gospels the Last Supper took place on the first night of Passover, defined in the Torah as occurring after the daylight of the 14th of Nisan. However, the Gospel of John implies that at the time of the trial the Jewish leaders had not yet eaten the Passover meal and that his sentencing took place on the day of Preparation of the Passover.[Jn. 19:14] John's account places the crucifixion on Nisan 14, since the law mandated the lamb had to be sacrificed between 3:00 pm and 5:00 pm and eaten before midnight on Nisan 14. This understanding fits well with Old Testament typology, in which Jesus entered Jerusalem to identify himself as the Paschal lamb on Nisan 10[Jn. Ex.] was crucified and died at 3:00 in the afternoon of Nisan 14, at the same time the High Priest would have sacrificed the Paschal lamb,[1 Cor. 5:7] [cf. Isa. 53:7-9] and rose before dawn the morning of Nisan 16, as a type of offering of the First Fruits.[1 Cor. 15:23] [cf. Lev. 23:9-14] However, "the day of preparation" has been seen to mean either the day before Passover or simply Friday; or both.
It is problematic to reconcile the chronology presented by John with the Synoptic passages and the tradition that the Last Supper was a Passover meal, placing the crucifixion instead on Nisan 15. Some scholars have attempted to explain the contradiction by postulating differences in how post-exilic Jews reckoned time: for Jesus and his disciples, the Passover could have begun at dawn Thursday, while for traditional Jews (following Leviticus 23:5), it would not have begun until dusk that same day. Another explanation that has been suggested is that Jesus chose to celebrate the Passover meal a day early with his disciples.[Mt. 26:18] [Lk. 22:15] 
D.A. Carson points out that there is no evidence that the term 'day of preparation of Passover' in John 19:14 ever means the day before the Passover meal. The word translated 'day of preparation' (παρασκευὴ) is the common word for 'Friday'. It is always the preparation day for the Sabbath (which is Saturday). The word translated 'Passover' (πάσχα) can mean either the Passover meal, Passover lamb or the entire feast of Unleavened Bread, otherwise known as Passover week. Hence John 19:14 should be understood as 'preparation day of Passover week'.
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The estimation of the hour of death of Jesus based on the New Testament accounts has been the subject of debate among scholars. Mark's passion narrative has three hour segments: in the early part Jesus is before Pilate, the Crucifixion takes place at the third hour (9am) in Mark 15:25, darkness appears at the six hour (noon) and Jesus' death at the ninth hour (3pm). However, in John 19:14 Jesus is still before Pilate at the sixth hour.
Some scholars have presented arguments to reconcile the accounts, although Raymond E. Brown, reviewing these, concluded that they can not be easily reconciled. Some have argued that the modern precision of marking the time of day should not be read back into the gospel accounts, written at a time when no standardization of timepieces, or exact recording of hours and minutes was available. Andreas Köstenberger argues that in the first century time was often estimated to the closest three-hour mark, and any time between 9am and noon could have been described as about the third or the sixth hour, and that the intention of the author of the Mark Gospel was to provide the setting for the three hours of darkness while the Gospel of John seeks to stress the length of the proceedings, starting in the 'early morning'"
In 1881, Brooke Foss Westcott suggested that the two accounts could be reconciled by assuming that John had followed the Roman practice of calculating the new day beginning at midnight, rather than the Jewish reckoning, although he admitted this would have been unusual at the time. In New Testament times, Jews regarded the day as beginning at sunset when precision was required, but otherwise, for practical purposes, at sunrise. The Evangelist John, writing primarily to Gentiles, it is suggested, chose the Roman legal use of time of reckoning, of counting the new day from midnight. Some scholars have postulated that the Roman reckoning was used by John, and that this is the reason for the apparent discrepancy with the other Gospel writers. Leon Morris, however, points out that this Roman practice was used only for dating contracts and leases, and days were normally counted from sunrise: "It is difficult to understand why this Evangelist alone should have such an unusual method of reckoning time". William Barclay has argued that the portrayal of the death of Jesus in the John Gospel is a literary construct, presenting the crucifixion as taking place at the time on the day of Passover when the sacrificial lamb would be killed, and thus portraying Jesus as the Lamb of God.
A wide range of approaches to the chronology of Jesus have been suggested over the centuries, but have little support among modern scholars, e.g. Maximus the Confessor, Eusebius, and Cassiodorus recorded the death of Jesus in 31 AD. The 3rd/4th century Roman historian Lactantius states that Jesus was crucified on a particular day in 29 AD, but that did not correspond to a full moon.
Some commentators have attempted to establish the date of birth by identifying the Star of Bethlehem with some known astronomical or astrological phenomenon. There are many possible phenomena and none seems to match the Gospel account. Many scholars regard the star as a literary invention of the author of the Gospel of Matthew, to claim fulfillment of an Old Testament prophecy (Numbers 24:17).