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46 BC in various calendars
Gregorian calendar	46 BC; XLVI BC
Ab urbe condita	708
Ancient Egypt era	XXXIII dynasty, 278
- Pharaoh	Cleopatra VII, 6
Ancient Greek era	183rd Olympiad, year 3
Assyrian calendar	4705
Balinese saka calendar	N/A
Bengali calendar	−639 – −638
Berber calendar	905
Buddhist calendar	499
Burmese calendar	−683
Byzantine calendar	5463–5464
Chinese calendar	甲戌年 (Wood Dog); 2652 or 2445; — to —; 乙亥年 (Wood Pig); 2653 or 2446
Coptic calendar	−329 – −328
Discordian calendar	1121
Ethiopian calendar	−53 – −52
Hebrew calendar	3715–3716
Hindu calendars
- Vikram Samvat	11–12
- Shaka Samvat	N/A
- Kali Yuga	3055–3056
Holocene calendar	9955
Iranian calendar	667 BP – 666 BP
Islamic calendar	688 BH – 686 BH
Javanese calendar	N/A
Julian calendar	46 BC; XLVI BC
Korean calendar	2288
Minguo calendar	1957 before ROC; 民前1957年
Nanakshahi calendar	−1513
Seleucid era	266/267 AG
Thai solar calendar	497–498
Tibetan calendar	阳木狗年; (male Wood-Dog); 81 or −300 or −1072; — to —; 阴木猪年; (female Wood-Pig); 82 or −299 or −1071

Millennium:	1st millennium BC
Centuries:	2nd century BC; 1st century BC ; 1st century;
Decades:	60s BC; 50s BC; 40s BC ; 30s BC; 20s BC;
Years:	49 BC; 48 BC; 47 BC; 46 BC ; 45 BC; 44 BC; 43 BC;

Year 46 BC was the last year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Caesar and Lepidus (or, less frequently, year 708 Ab urbe condita). The denomination 46 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

This year marks the change from the pre-Julian Roman calendar to the Julian calendar. The Romans had to periodically add a leap month every few years to keep the calendar year in sync with the solar year but had missed a few with the chaos of the civil wars of the late republic. Julius Caesar added Mercedonius (23 days) and two other intercalary months (33 and 34 days respectively) to the 355-day lunar year, to recalibrate the calendar in preparation for his calendar reform, which went into effect in 45 BC.^[1]^[2]^[3] The resulting calendar year, the longest calendar year in recorded history, lasted 445 days — nearly 80 days longer than the sidereal year (the orbit of Earth around the Sun) — and was nicknamed the annus confusionis ("Year of Confusion").^[4]

Events

By place

Roman Republic

Consuls: Gaius Julius Caesar, Marcus Aemilius Lepidus.
Julius Caesar establishes Julia Paterna Arelate as a colony in Gaul for veterans of the Sixth Legion, at the present day site of Arles.^[5]
Civil War:
- January 4 – Titus Labienus fights Julius Caesar in the Battle of Ruspina.
- April - Caesar defeats Pompey loyalists at Thapsus.^[6]
- April 6 – Caesar defeats the combined army of Pompeian followers and Numidians under Metellus Scipio and Juba I of Numidia at Thapsus. After the battle Caesar grants Legio V Alaudae the right to bear the elephant symbol on its shields and standards, for bravery against a charge of elephants.
- April 20 – Cicero, in Rome, writes to Varro "If our voices are no longer heard in the Senate and in the Forum, let us follow the example of the ancient sages and serve our country through our writings, concentrating on questions of ethics and constitutional law."
- Caesar's erstwhile mistress, Queen Cleopatra VII of Egypt, and his son by her, Caesarion, take up residence in one of the dictator's estates on the Tiber.
- September 26 – Julius Caesar dedicates a temple to his mythical ancestor Venus Genetrix in fulfillment of a vow he made at the battle of Pharsalus.
- November – Caesar leaves for Hispania to deal with a fresh outbreak of resistance.
- Caesar reforms the Roman calendar to create the Julian calendar. The transitional year is extended to 445 days to synchronize the new calendar and the seasonal cycle. The Julian Calendar would remain the standard in the western world for over 1600 years, until superseded by the Gregorian Calendar in 1582.
- Caesar appoints his nephew Octavian his heir.
- Caesar subdues a mutiny of his Tenth Legion.
- Caesar celebrates his Gallic Triumph, after which Vercingetorix is executed. The celebrations run for forty days in Rome, and include public banquets, plays and gladiatorial games.

By topic

Births

Antipater, son of Herod the Great (d. 4 BC)
Lucius Seius Strabo, Roman prefect of the Praetorian Guard (d. 16 AD)
Publius Quinctilius Varus, Roman politician and general (d. 9 AD)

Deaths

April 12 - Marcus Porcius Cato (the Younger), Roman politician (b. 95 BC) (commits suicide)
Faustus Cornelius Sulla, Roman politician and quaestor
Juba I, king of Numidia (killed after the Battle of Thapsus)
Saburra, General of Juba I (killed in battle by Publius Sittius)
Lucius Afranius, Roman consul and governor (b. 112 BC)
Lucius Manlius Torquatus, Roman politician and general
Marcus Petreius, Roman politician and general (b. 110 BC) (commits suicide)
Quintus Caecilius Metellus Scipio, Roman consul and general (commits suicide)
Vercingetorix, Gaulish king and chieftain of the Arverni tribe (executed at the end of a triumph)

References

^ Tranquillus, C. Suetonius (1893) [121]. "Caius Julius Casar". The Lives of the Twelve Caesars. Translated by Thomson, Alexander.
^ Armstrong, Richard; Lienhard, John H. (host) (2008). "The Longest Year in History". The Engines of Our Ingenuity. Episode 2364. Cullen College of Engineering, University of Houston.
^ Manoukian, Marina (August 26, 2020). "Why 46 BC Was The Longest Year Ever". Grunge.com.
^ Pogge, Richard. "Lecture 11: The Calendar". Astronomy 161: An Introduction to Solar System Astronomy. Ohio State University.
^ Stambaugh, John E. (1988). The Ancient Roman City. Baltimore: Johns Hopkins University Press. p. 275. ISBN 0-8018-3574-7.
^ LeGlay, Marcel; Voisin, Jean-Louis; Le Bohec, Yann (2001). A History of Rome (Second ed.). Malden, Massachusetts: Blackwell. p. 129. ISBN 0-631-21858-0.