
Background
The usual view among New Testament chronologists assumes that the reign of Tiberius began at Augustus’s death in AD 14. Yet, the possibility that Tiberius’s contemporaries reckoned the start of his reign differently than we do deserves careful consideration.
Why? Because at that time, no precedent existed for transitioning from one Roman emperor to another. Augustus wished to prepare for an orderly transition to his chosen successor, Tiberius. Unlike all future successions, it involved setting up in advance a guiding legal structure for it.
So, it is fair to ask whether Luke, when he traced the start of the ministry of John the Baptist to “the fifteenth year of the reign of Tiberius Caesar” (Lk 3:1), may have started Tiberius’s reign from a different beginning than the AD 14 death of Augustus.
A close look at Roman coins from the closing years of Augustus’s reign, together with historical records that provide a way to confidently understand the coins’ symbolism, seems to indicate that this was the case.
Two Ancient Sources
1. Velleius Paterculus, a soldier who served under Tiberius, wrote,
At the request of his father [Augustus] that he should have in all the provinces and armies a power equal to his own, the senate and Roman people so decreed. . . . On his return to the city he celebrated the triumph over the Pannonians and Dalmatians, long since due him, but postponed by reason of a succession of wars. (Vell. 2.121.1–2)1
The Fasti Praenestini inscription says that that triumph was on October 23, AD 12.2 By mentioning the increase of Tiberius’s powers first, Velleius implies that it took place in AD 12.
2. Suetonius, in contrast to Velleius’s report, states that the triumph came before Tiberius’s powers were increased:
After two years he [Tiberius] returned to the city from Germany and celebrated the triumph which he had postponed. . . . The consuls caused a law to be passed soon after this [the triumph] that he should govern the provinces jointly with Augustus and hold the census with him. (Tiberius 20–21)3
“The provinces” has particular reference to the imperial provinces, where Roman legions were stationed and which were directly governed by the emperor through his appointed legates. This was in contrast to the more settled senatorial provinces, which were under the indirect oversight of the senate.
Pliny (Letters 10.94) called Suetonius “a person of great merit and learning, as well as of noble birth.”4 Suetonius held several important offices devoted to accurate recordkeeping: being a bybliothecis implied he was responsible for the libraries in Rome; as a studiis he was responsible for finding records in the Roman archives; and as ab epistulis he handled the imperial correspondence.5 These official positions predispose us to expect that he would have accurately set forth historical facts in his history of Tiberius, including when this law was passed relative to the triumph.
Further, Velleius’s account preceded that of Suetonius by roughly eighty years. We may reasonably assume Suetonius’s background would have made him familiar with his predecessor’s work, and he would have had no reason to diverge from it unless his research revealed that Velleius had erred or been unclear.
Thus, we may regard Suetonius’s account as the most accurate. This triumph of Tiberius took place in Rome in late AD 12 prior to the law being passed.
Besides, the high honor of imperium power over all provinces and armies was unlikely to have been granted to Tiberius in absentia.
Tiberius’s Increased Powers Were Given by a Law
Velleius wrote that these expanded powers were given by a decree of “the senate and Roman people.” Suetonius similarly reported that the consuls caused a law to be passed giving Tiberius these powers.
Velleius says it was done this way at Augustus’s behest, so that Tiberius’s powers would fully match his own before his death. His objective was to ensure a peaceful transfer of power, and to prevent anyone from changing his plans for the transition.
The 19th-century German classicist A. W. Zumpt wrote,
For the tribunician and proconsular power, all that was required was a senate resolution, and command in the imperial provinces was transferred by the emperor personally. Now, in addition to the senate resolution, a resolution from the centurions [representatives of the people] was added. Tiberius changed from a subject to a real coregent, and that is how he is called by Tacitus.6
Tacitus wrote that Tiberius was a “colleague in the empire” and “consort of the tribunician power” (Annals 1.3).7
A second 19th-century German scholar, Bernhard Pick, also recognized that the involvement of “the people” in the increase in Tiberius’s power was crucial:
By having this power transferred to his son by popular vote, the emperor himself showed how much he felt the far-reaching significance of the new institution; the popular decision legalized the deviation from the previous principate and the introduction of [full] collegiality.8
J. B. Bury also wrote at the end of the 19th century:
It is significant that the proconsular power was conferred by a law. In all previous cases, Augustus had bestowed it by virtue of his own proconsular imperium. But now the power of Tiberius in the provinces is no longer secondary, but is co-ordinate with, and limits, that of Augustus himself, and does not expire with the death of Augustus. It is therefore conferred by a lex.9
Thus, this law made Tiberius’s authority in the provinces fully equal to that of Augustus. Honorific titles unique to Augustus only reflected his auctoritas, the high respect given him, not the powers he wielded in the empire that Tiberius now shared equally.
The Law Making Tiberius Coregent Required Time to Be Passed
Bury pointed out that, first, the senate recommended the proposed law; second, the people’s representatives, the centurions, discussed and approved it, a process that minimally involved three periods of eight days, called the trinum nundinum; and third, the consuls implemented the approved law.10
These factors meant that quick approval of the law by the end of AD 12 was unlikely. This results in disagreements with the competing theory of an AD 12 coregency of Tiberius.
Bury added,
Nine years later [after his adoption in AD 4] (13 A.D.) Tiberius was raised higher than any previous consort. It was enacted by a special law (lex), introduced by the consuls, that he should have proconsular power in all the provinces and over all the armies, co-ordinate with the proconsular power of his “father,” and that he should hold a census in conjunction with Augustus.11
Garrett G. Fagan similarly wrote,
From A.D. 4 to 14 Tiberius was clearly Augustus’s successor. When he was adopted, he also received grants of proconsular power and tribunician power; and in A.D. 13 his proconsular power was made co-extensive with that of Augustus. In effect, Tiberius was now co-princeps [“first citizen”] with Augustus.12
Latinist N. S. Gill corroborates this: “In 13 A.D., Augustus made Tiberius co-regent. When Augustus died, Tiberius already had imperial power.”13
Importantly, no “fifteenth year of Tiberius” bias tied to theological considerations influenced these secular scholars to make AD 14 the start of Tiberius’s reign. They were theologically neutral.
Since the law that made Tiberius coregent took time to finalize, it is not surprising that these three classical historians begin Tiberius’s reign in AD 13.
Augustus’s Res Gestae inscription is consistent with what these classicists wrote:
A third time, with the consular imperium, and with my son Tiberius Caesar as my colleague, I performed the lustrum in the consulship of Sextus Pompeius and Sextus Apuleius. (Res Gestae 8)14
A lustrum was a ceremony that concluded a Roman census. Pompeius and Appuleius became consuls in January of AD 14, thereby establishing that as the census/lustrum year.
It would logically have been premature for discussions of Tiberius’s role in the May 11, AD 14 lustrum15 to have been raised near the end of October, AD 12, over a year and a half beforehand and under a different set of consuls near the end of their terms.
Any decisions affecting Tiberius’s role in the lustrum, therefore, would be expected to be made in AD 13, just a few months before the census.
An Objective Basis for Dating: The Tribunicia Potestas
Augustus’s reign could be variously dated from 31 BC, the year he defeated Antony at Actium; from 27 BC, when the senate gave him the honorific title “augustus”; or from 23 BC, when he was granted the powers of a tribune, the tribunicia potestas.
Bury says, “In 23 B.C. he [Augustus] . . . made the tribunicia potestas, instead of the consulship, which he resigned on June 27, the second pillar of his power. The tribunician power was his for life, but he now made it annual as well as perpetual, and dated from this year the years of his reign.”16
The annual renewal of the tribunicia potestas was signified on coins by the inscription “TR POT” or something similar.
C. H. V. Sutherland states that it was renewed for both Augustus and Tiberius each July after 23 BC, so each of its years spanned two BC/AD years.17 For this reason the coins of Augustus and Tiberius are always dated as a range (e.g., TR POT Year 15 = AD 13/14).
T. Corey Brennan, Professor of Classics at Rutgers, writes, “In official titulature the emperors commonly list it second among their distinctions (with number of continuous years held, thus functioning akin to a regnal year).”18
Harriet I. Flower, Professor of Classics at Princeton, agrees: “The TRIB POT tracks the regnal years.”19
Therefore, on the coins of Augustus the tribunicia potestas became his primary regnal year tracker as of July, 23 BC. It constituted an objective basis for dating later events of his reign commemorated on his coins.
Augustus Coins 471 (AD 11/12) and 226 (AD 13/14)

On the Online Coins of the Roman Empire (OCRE) website, the coin designated RIC 471 for AD 11/12 says “TRIBUN POT Year 34.”20 This was the last known coin commemorating the years of Augustus’s reign. As expected, it counts back to 23/22 BC. The coin RIC 226 for AD 13/14, however, specifies Tiberius’s TR POT Year 15 on the reverse, indicating that the latter’s status was raised that year.
Comparing the two previous coins shows that Tiberius’s TR POT years were counted from a different start date than those of Augustus.
Tiberius first received the tribunicia potestas for a five-year term starting in 6 BC (Cassius Dio, Roman History 55.9.1–4). Then, after an interruption caused by his retreat/exile to Rhodes, the death of Augustus’s son Gaius Caesar on June 26, AD 4 prompted Augustus to adopt Tiberius as his son.
At that time Tiberius’s tribunicia potestas was renewed for another ten years (Cassius Dio, Roman History 55.13.1a). He thus had a total of 15 years of tribunicia potestas that extended through the tenth year of his second renewal.
This means that Tiberius’s TR POT Year 15 was July, AD 13 through June, AD 14. Augustus apparently never recorded a TR POT year after AD 11/12.
The Imperial Coins of Augustus

Augustus’s coins RIC 221 through 224 for AD 13/14 therefore are inscribed “TR POT Year 15.” Their imagery of the chariot and horses over Tiberius’s name commemorates his triumph on October 23, AD 12. That Tiberius’s TR POT year is given for the first time reflects his newly expanded powers.
The Imperial Coins of Tiberius

The coins designated RIC 225 and 226 for AD 13/14 also indicate “TR POT Year 15.” Featuring equally sized portraits of Augustus and Tiberius, they reflect the passing of the law of “the senate and the people” and commemorate the start of the full coregency in AD 13/14, while Augustus still lived.
These AD 13/14 coins are the only ones during Augustus’s life that portray Tiberius with him in this manner. Their symbolism aligns with what Velleius, Suetonius, and Tacitus reported about the law that raised Tiberius to become coruler.
That Tiberius’s portrait on the AD 13/14 coins lacks a laurel wreath only signifies Augustus’s greater auctoritas as “son of the divine, father of the nation,” not a difference in powers or identity as emperor. After all, a coin from 11/10 BC (RIC 177) shows Augustus himself with no laurel wreath.


The following year, AD 14/15, was Tiberius’s TR POT Year 16—his second regnal year. Augustus died that August, so his portrait is gone and Tiberius, now elevated in auctoritas and wearing a laurel wreath, stands alone. The reverse side commemorates his seventh imperatorial acclamation.
Provincial Coin of Tiberius from Judea (Hendin 639)
That the year of Augustus’s death fell in Tiberius’s second regnal year explains why the first coin of Valerius Gratus, who was appointed prefect of the imperial province of Judea by Tiberius in late AD 14, is dated “LB.” No earlier “LA” coin is known.

Provincial Coins of Tiberius from Syria
The Syrians began the Caesarean Era (CE) as of October 49 BC, honoring Julius, who granted them autonomous rule from Pompey. “AYT” on Syrian coins from that time reflected this “autonomous” provincial (Macedonian calendar) reckoning.
Octavian later defeated Antony off Actium, Greece, on September 2, 31 BC. At this time he began referring to the Actian Era (AE) of his reign. From 6 BC through AD 12 he minted his own AE-dated coins (using Julian calendar reckoning) at Antioch commemorating that victory. These were stamped with “ANT” and the count of years since his “year of victory” (“ETOYΣ NIKHΣ”) rather than from the provincial CE date given on the “autonomous” coins.

Using their Macedonian calendar, Syria began the Actian Era in October, 32 BC.21 Coins of the Syrian governor Silanus double-date by provincial (not Augustan) AE years 45 and 47 (= CE 63 and 65) and years of Tiberius’s reign (A = Year 1, Γ = Year 3).

Six Conclusions from the Coins
1. TR POT inscriptions on imperial Roman coins gave an objective way to track the regnal years of Augustus and Tiberius.
2. The unique AD 13/14 coins bearing both portraits, as well as being the first to display Tiberius’s TR POT years, would have informed the entire realm of Tiberius’s elevation to co-reign with Augustus.
3. The importance of the TR POT in defining the regnal years of Augustus and Tiberius also indicates that legally granted powers defined the essence of what a Roman emperor was at that time, not honorary titles.
4. It is unlikely that Luke, a Gentile from Antioch, had access to official Roman records for determining the fifteenth year of Tiberius. The widespread Roman imperial coinage, though, would have been a readily accessible indication of the start of his reign. In particular, the Syrian provincial coins of Silanus issued in AD 13/14 reflect common knowledge in Luke’s hometown of Antioch of when Tiberius’s reign began.
5. Thus, both imperial and provincial coinage indicate that Luke and his contemporaries across the Roman world would have viewed the first year of Tiberius as AD 13/14. This means AD 27/28 would have been regarded as his fifteenth year—with Jesus baptized in the fall of AD 27.
6. Nonetheless, as the reigns of later emperors came to be measured from the deaths of their predecessors, it was eventually forgotten that Tiberius’s reign began before Augustus’s death. Tiberius, raised to rule via the passing of a law rather than his predecessor’s death, was an exception to the later norm.
Two Corroborations from Scripture
But what about conflicts with Scripture? Can we reconcile an AD 13/14 start for Tiberius’s reign with (1) the Seventy “Weeks” (i.e., “sevens,” sabbatical year cycles) Prophecy of Daniel 9:24–27 and (2) the well-known NT chronology of Harold Hoehner?
The Seventy “Weeks” Prophecy of Daniel 9:24–27
Daniel 9:25: “So you are to know and discern that from the issuing of a decree [Heb. davar, “word”] to restore and rebuild Jerusalem until Messiah the Prince there will be seven weeks [“sevens”] and sixty-two weeks [“sevens”].”22
This “decree” was an official public document like those issued earlier by Cyrus and Darius (Ezra 6:3, “Cyrus the king issued a decree [Aram. ta`am]”; cf. 6:1, 6:8, 6:11, 6:14). Hoehner, like J. N. Darby and Sir Robert Anderson before him, believed it referred to the sending of Nehemiah to Jerusalem to begin rebuilding the city in Artaxerxes’s 20th regnal year, 444 BC.
In Ezra 4, Artaxerxes, at the start of his reign, was approached by a delegation of Samaritans complaining that the returned exiles were violating the prohibition against city rebuilding that had stood under both Cyrus and Darius. In their message, they equated this with “finishing the walls and repairing the foundations” (Ezra 4:12).
Artaxerxes checked out this allegation and agreed (Ezra 4:19). He issued an edict to stop such city-centric work.
But, he added in Ezra 4:21 that he himself would issue a future decree that would allow rebuilding the city: “the city may not be rebuilt until a decree [ta`am] is issued by me.” This was the same Aramaic word for “decree” used for the edicts of Cyrus and Darius found in the records referenced in Ezra 6.
When did Artaxerxes issue that future “ta`am”?
Ezra 7:21: “And I, even I King Artaxerxes, issue a decree [ta`am] to all the treasurers who are in the provinces beyond the River, that whatever Ezra the priest, the scribe of the law of the God of heaven, may require of you, it shall be done diligently.” This was issued in his seventh regnal year, 457 BC. After this, Scripture knows of no other ta`am made by Artaxerxes, so it had to be the one promised in Ezra 4:21.
Nehemiah’s 444 BC trip to Judea, however, involved no “decrees,” but only “letters” [Heb. ‘iggereth] of permission to cross borders and get construction timbers (Neh. 2:7–9). Such narrowly defined and focused communications do not fit the nature of the public document described by Daniel 9:25.
The arrival of Ezra in Jerusalem must be dated to 457 BC because Nehemiah 1:1 and 2:1 use the month names Chislev and Nisan, respectively.
The only way both Chislev (Nov–Dec) and Nisan (Mar–Apr) could fall in Artaxerxes’s 20th regnal year, and in that order, is if Persian regnal years were reckoned on a fall-to-fall basis during the time of Ezra and Nehemiah. It indicates that Artaxerxes’s seventh regnal year was from Tishri, 458 BC, to Elul, 457 BC.
Therefore Nisan, the “first month” according to the civil year (reckoned spring-to-spring, cf. Esther 3:7), when Ezra 7:9 says Ezra left for Jerusalem, was Nisan, 457 BC.
Nehemiah’s deep grief at learning from Hanani that the walls still remained unrepaired (Neh. 1:4: “I sat down and wept and mourned for days”) makes the best sense if he expected that city repair work had been completed years earlier. Nehemiah’s city work in 444 BC was thus the delayed implementation of that earlier ta`am of Artaxerxes.
With Tishri, 457 BC set as the start for counting Daniel’s first 69 “weeks” (483 years), that period ended when Tishri, AD 27 began. This matches the AD 27/28 fifteenth year of Tiberius when the first year of his reign is set to AD 13/14, consistent with the Roman coinage and histories.
Therefore, no other ta`am decree was issued by Artaxerxes after that of his seventh year (Ezra 7:21). It would have provided funds not earmarked for temple needs (Ezra 7:18). This would have included the wall repairs that were not finished until Nehemiah arrived.
But some may object that this is reading a hypothetical city construction permission onto the 457 BC decree, which should not overrule the obvious fact that wall repairs were done in 444 BC. What do we say to this?
In Ezra 9, Ezra expresses shock and dismay at discovering that even the leaders of the exiles had begun to take wives from among the people of the land. In his prayer that God would forgive this, he recounts the blessings that had already been given to the people: “For we are slaves; yet in our bondage, our God has not forsaken us, but has extended lovingkindness to us in the sight of the kings of Persia, to give us reviving [1] to raise up the house of our God, [2] to restore its ruins, and [3] to give us a wall in Judah and Jerusalem” (9:9).
When was this “lovingkindness” extended? The context requires it to have been included in the 457 BC ta`am decree.
The NT Chronology of Harold Hoehner
The wide distribution of this theory in the evangelical world has led many to regard it as historical fact. Yet, this theory (1) requires that the fifteenth year of Tiberius not begin until AD 29 (with AD 14 being his first year); (2) requires stretching Jesus’s first year of ministry to two years to yield a three-and-a-half-year public ministry, at apparent odds with the two and a half years indicated by the Passovers listed in John’s Gospel; and (3) applies 360-day “prophetic years” to the entire 490 years covered by the “seventy weeks” prophecy in Daniel 9:24–27, which is incompatible with all normal Jewish calendars.
Are 360-Day “Prophetic Years” Valid Exegesis?
Every instance of a 360-day “prophetic year” in Scripture is contextually restricted in Daniel and Revelation to the last half of Daniel’s “seventieth week,” when the Jews are persecuted by the end-times Antichrist.
Dan. 7:25: “And he [the Antichrist] will speak out against the Most High and wear down the saints of the Highest One, and he will intend to make alterations in times and in law; and they will be given into his hand for a time, times, and half a time.”
Dan. 12:7: “And I heard the man dressed in linen, who was above the waters of the river, as he raised his right hand and his left toward heaven, and swore by Him who lives forever that it would be for a time, times, and half a time; and as soon as they [who follow the Antichrist] finish shattering the power of the holy people, all these events will be completed.”
Rev. 11:2–3: “And leave out the court which is outside the temple, and do not measure it, for it has been given to the nations [who follow the Antichrist]; and they will tread under foot the holy city for forty-two months. And I will grant authority to my two witnesses [against the Antichrist], and they will prophesy for twelve hundred and sixty days, clothed in sackcloth.”
Rev. 12:6: “And the woman [Israel] fled [from the Antichrist] into the wilderness where she had a place prepared by God, so that there she might be nourished for one thousand two hundred and sixty days.”
Rev. 12:14: “And the two wings of the great eagle were given to the woman, in order that she might fly into the wilderness to her place, where she was nourished for a time and times and half a time, from the presence of the serpent [personified in the Antichrist].”
Rev. 13:5: “And there was given to him [the Antichrist] a mouth speaking arrogant words and blasphemies; and authority to act for forty-two months was given to him.”
If every instance of a supposed “prophetic year” in Scripture is restricted to the context of the second half of Daniel’s “seventieth week,” then where is the exegetical justification for generalizing that idea to every year of the first 69 “weeks” of the prophecy—i.e., for 483 360-day years?
This concept appears assumed only to allow the chronology to start with an assumed decree to Nehemiah in 444 BC.
Daniel 9:25 Has the Messiah Manifested in AD 27
The “seventy weeks” prophecy of Daniel 9:24–27 refers to seventy sabbatical year cycles, each seven years in length. Because they have to do with planting and harvesting and allowing a year of rest for the fields every seven years, they start in Tishri in the fall.
When Tishri 1, 457 BC is used to start Daniel’s count of 483 normal years “until” (Heb. ad, Dan. 9:25) the Messiah would be “manifested to Israel” at John’s baptism (Jn. 1:31), that period ends on Tishri 1, AD 27. This exactly fits the data we saw derived from the Roman histories and coins.
The Public Ministry of Jesus Lasted Two and a Half Years
The view that Jesus had a three-and-a-half-year public ministry is tied directly to Hoehner’s timeline, where Christ was baptized in AD 29 and crucified in AD 33. It assumes that there was an unmentioned fourth Passover during Jesus’s ministry to make those dates work with Anderson’s 360-day “prophetic years.”
But John’s Gospel mentions three Passovers by name (2:13, 6:4, 11:55). Proposing a fourth begs the question of why it is unmentioned by John. A more natural interpretation is that Jesus’s public ministry lasted only two years, AD 28–29 and AD 29–30, bookended by His first and last Passovers.
In particular, Hoehner made the crucial assumption that the grain (Heb. qāmâ) plucked by the disciples on a Sabbath (Mt. 12:1; Mk. 2:23; Lk. 6:1) was from the early barley crop. He failed to consider that it was more likely gleanings (Dt. 23:25) from the wheat crop near Shavuot (Pentecost) seven weeks later, which celebrated the first fruits of the wheat harvest (Ex. 34:22). Oded Borowski notes that in Galilee, part of the grain harvest would be completed after Pentecost.23 In this case Hoehner’s proposed extra year is unnecessary, and John’s chronology is affirmed.
This is illustrated by the following timeline, which exactly follows the order of events in John’s Gospel.
The Two-and-a-Half-Year Alternative to Hoehner’s Three-and-a-Half-Year Timeline
1. Jesus was baptized in the fall of AD 27. (Recall that the coin data indicates that AD 27/28 was Tiberius’s fifteenth year.)
2. After the wilderness temptations (Mt. 4:1; Mk. 1:12; Lk. 4:1), He began to gather His disciples in late AD 27.
3. John 2:13—Jesus and His disciples went to the Passover in the spring of AD 28, when His public ministry gets underway.
4. John 3:22—They next baptized in the Judean countryside.
5. Shavuot (Pentecost) was a pilgrimage feast (Lev. 23:16–21), so they took advantage of their nearness to Jerusalem to attend it in mid-May, AD 28.
6. John 4:1–4—Their nearby baptizing drew unwelcome scrutiny by the Pharisees (possibly at Shavuot), so they left for Galilee via Samaria.
7. John 4:7ff.—On the way, Jesus encountered the Samaritan woman at the well. (Hoehner places this in the spring of AD 30.)
8. John 4:35—His words to the disciples, “Do you not say, ‘There are yet four months, and then comes the harvest’?,” precisely fit the time from Shavuot (May–June) to Sukkot (Sep–Oct), the Feast of the Ingathering (Ex. 23:16). This marked the final harvest of the year, “after you have gathered in from your threshing floor and your wine vat” (Dt. 16:13). The springtime harvests having already ended, Jesus appears to be viewing the approaching Samaritans as a type of the final ingathering of souls at the end of the age.
9. On the return of Jesus and His disciples to Galilee in late spring AD 28, some Pharisees caught the disciples plucking grains of wheat, not barley, left in the fields for the needy to glean (Lev. 23:22).
10. John 5:1—After this was an unnamed feast, probably Sukkot (Tabernacles), the only remaining pilgrimage feast unaccounted for by John during the first year of Jesus’s ministry.
11. John 6:4—The following year, AD 29, the feeding of the 5,000 took place “on green grass” (Mk. 6:39), apparently in early spring, followed by His second Passover.
12. John 11:55—Finally, John’s third Passover was the last of Jesus’s ministry, when He was crucified on Friday, April 7, AD 30.
Thus, we see that everything in Jesus’s public ministry is accounted for in John’s Gospel, with no need to stretch it from two and a half to three and a half years.
Conclusions
Compelling numismatic, historical, and biblical reasons coincide to conclude that Jesus was baptized in early fall of AD 27, began His ministry in AD 28, and was crucified in the spring of AD 30. Roman coins understood in the light of ancient records indicate that Luke would have known that Tiberius assumed the powers of a coregent with Augustus in AD 13/14. This would make the fifteenth year of Tiberius AD 27/28.
This view is validated by a straightforward interpretation of the prophecy of the “seventy weeks” in Daniel 9:24–27, where the end of the first 69 “sevens” coincides with Jesus’s baptism in the fall of AD 27. And it requires no padding of the timeline of Jesus’s public ministry from two and a half to three and a half years by assuming 360-day years and adding a conjectural fourth Passover.
Endnotes
1 Frederick W. Shipley, trans., Velleius Paterculus and Res Gestae Divi Augusti, The Loeb Classical Library (William Heinemann; Harvard University Press, 1961), 307.
2 Ehrenberg and Jones, 1967.
3 J. C. Rolfe, trans., Suetonius, 2 vols., The Loeb Classical Library (Harvard University Press; William Heinemann, 1979), 1:323.
4 Pliny: Letters, trans. William Melmoth, revised by W. M. L. Hutchinson, 2 vols., The Loeb Classical Library (William Heinemann; Macmillan, 1915), 2:399.
5 “Suetonius,” Livius.org, last modified September 8, 2020, https://www.livius.org/sources/content/suetonius/.
6 Das Geburtsjahr Christi: Geschichtlich-chronologische Untersuchungen (Leipzig, 1869), 289. My translation.
7 Tacitus: The Histories, The Annals, trans. Clifford H. Moore, John Jackson, vol. 2, Histories, Books IV–V; Annals, Books I–III, The Loeb Classical Library (Harvard University Press; William Heinemann, 1962), 247.
8 “Zur Titulatur der Flavier: I: Der Imperatortitel des Titus,” Zeitschrift für Numismatik 13 (1885): 218–19. My translation.
9 A History of the Roman Empire from Its Foundation to the Death of Marcus Aurelius (27 B.C.–180 A.D.) (New York, 1893), 54–55.
10 History of the Roman Empire, 17–18.
11 History of the Roman Empire, 54. “13 A.D.” date in the original; emphasis added.
12 “Tiberius (A.D. 14-37),” De Imperatoribus Romanis: An Online Encyclopedia of Roman Emperors, updated December 22, 2001, https://roman-emperors.sites.luc.edu/tiberius.htm.
13 N. S. Gill, “Who Were the Imperial Roman Emperors?,” ThoughtCo., updated November 25, 2019, https://www.thoughtco.com/roman-imperial-succession-julio-claudian-era-120625.
14 Shipley, Velleius Paterculus and Res Gestae Divi Augusti, 357, 359.
15 Zumpt, Das Geburtsjahr Christi, 294.
16 History of the Roman Empire, 13.
17 The Roman Imperial Coinage, vol. 1 (Spink, 1984), 56.
18 “Tribunicia Potestas,” Oxford Classical Dictionary, October 26, 2017, https://doi.org/10.1093/acrefore/9780199381135.013.8196.
19 Email message to author, October 28, 2024.
20 “RIC I (second edition) Augustus 471,” Online Coins of the Roman Empire, American Numismatic Society, accessed January 6, 2026, https://numismatics.org/ocre/id/ric.1(2).aug.471.
21 Wilhelm Kubitschek, “Jahrzählung und Jahranfang im römischen Makedonien,” Archaeologisch-epigraphische Mittheilungen aus Oesterreich-Ungarn 13, no. 1 (1890): 120–21.
22 The 1977 edition of the NASB is used for Scripture quotations in this article.
23 Agriculture in Iron Age Israel (Eisenbrauns, 1987), 57.


























This calendar demonstrates how the 2-2-1-2-2-2-1 pattern and the conjunction New Moons of every month fit together with the first visible crescents of the Babylonians from 19 BC through AD 38. The first visible crescents reported by the Babylonians unfailingly begin not more than three days after every conjunction. This indicates the reliability of the adapted Babylonian data (with the Adar-II > Nisan shift) as an indicator of the Jewish observed first crescents, showing that we need not assume dependence on the vernal equinox by the early Hebrews. This approach to creating a calendar avoids the subjectivity involved in deciding if any particular first crescent observation at Babylon matched up with that at Jerusalem.
It will be noted in the chart that I did not use the USNO’s earlier lunations in 16 BC, AD 4 and AD 23 (tinted in red – March 10, 9 and 10 respectively) for the Exodus Hebrew Calendar, instead assigning Nisan to the corresponding subsequent lunations on April 9, 8 and 8 (the last at 10 pm Greenwich time, therefore on Jewish date April 9). The earliest acceptable astronomical New Moon in the Exodus Hebrew Calendar is on March 11, seen in AD 12 and 31, because it fits the 2-2-1-2-2-2-1 pattern of the Babylonian data in P&D and the Karaite data. The latest acceptable Nisan 14 date is April 22.






