Notice: This is the second of three solar eclipses I’ve learned of that are effective anchor points for the Olympic year calendar. Because there are only two other solar eclipses at all visible over Europe or the Mediterranean area within three years, plus or minus, of August 15, BCE, that is, 1) December 29, 309 BCE, and 2) June 14, 307 BCE, this August 15, 310 BCE total solar eclipse is inconvertible, or so I believe, confirmation of the correctness of the first and the third of said three solar eclipses.

Quoting Diodorus:

113 When Agesias was archon at Athens, the Romans installed as consuls Gaius Publius and Papirius, and the one hundred and fourteenth celebration of the Olympic Games took place, in which Micinas of Rhodes won the foot race.* Now from practically all the inhabited world came envoys on various missions, some congratulating Alexander on his victories, some bringing him crowns, other concluding treaties of friendship and alliance, many bringing handsome presents, and some prepared to defend themselves against accusations.”

*)Hegesias (as the name appears in the Attic inscriptions) was archon from July 324 to June 323 B.C. The consuls of 326 B.C. were C. Poetelius Libo Visolus and L. Papirius Cursor (Broughton, 1.146). The Olympic Games were held in the summer of 324 B.C. (chap. 109.1). The name of the victor is given as Macinnas by Eusebius. The time was actually the spring of 323 B.C.”

Diodorus Sicilus, Library of History, Book XVII, with original editor’s footnote.

“8… 2 A short time before his death, Alexander decided to restore all the exiles in the Greek cities, partly for the sake of gaining fame, and partly wishing to secure many devoted personal followers in each city to counter the revolutionary movements and seditions of the Greeks. 3 Therefore, the Olympic games being at hand,* he sent Nicanor of Stageira to Greece, giving him a decree about the restoration, which he ordered him to have proclaimed by the victorious herald to the crowds at the festival.”

*) “In 324, the year before Alexander's death.”

Diodorus Sicilus, Library of History, Book XVIII, with original editor’s footnote.

17 When Democleides was archon at Athens, the Romans elected Gaius Junius and Quintus Aemilius consuls.* This was the one hundred and sixteenth celebration of the Olympic Games, at which Deinomenes the Laconian won the footrace.”

*)Democleides was archon in 316/15. According to the traditional chronology, C. Junius Bubulcus and Q. Aemilius Barbula were consuls in 317 (Livy, 9.20.7; Fasti Capitolini for 317). Chapters 17‑38 continue to relate events of 317 B.C.”

Diodorus Sicilus, Library of History, Book XIX, with original editor’s footnote.

55 When this year had passed, Praxibulus was archon at Athens and in Rome Nautius Spurius and Marcus Poplius were consuls.29

77 When this year had passed, Polemon was archon in Athens, and in Rome the consuls were Lucius Papirius for the fifth time and Gaius Iunius;* and in this year the Olympic Games were celebrated for the one hundred and seventeenth time, Parmenion of Mitylenê winning the footrace.”

105 When Simonides was archon in Athens, the Romans elected to the consulship Marcus Valerius and Publius Decius.**

Praxibulus was archon in 315/14. Spurius Nautius Rutilus and M. Popilius Laenas were consuls in 316 (Livy, 9.21.1; Fasti Capitolini for 316). The events described in this chapter and the next still belong to the year 316 B.C. (Beloch, Griechische Geschichte2, 4.2.240).”

*) “Polemon was archon in 312/11 B.C. In the Fasti Capitolini the consuls for 313 B.C. are L. Papirius Cursor for the fifth time and C. Iunius Bubulcus Brutus for the second time (CIL I, p130; cp. Livy, 9.28.2). The events related in chaps. 77‑80 still belong to the year 313 B.C.”

**) Simonides was archon in 311/10 B.C. In the Fasti the consuls of 312 B.C. are M. Valerius Maximus and P. Decius Mus (CIL I, p130; cpLivy 9.28.8). The narrative is continued from chap. 100.7.”

Diodorus Sicilus, Library of History, Book XIX, with original editor’s footnote.

“3 When Hieromnemon was archon in Athens, the Romans elected to the consulship Gaius Julius and Quintus Aemilius;* and in Sicily Agathocles, who had been defeated by the Carthaginians in the battle at the Himeras River and had lost the largest and strongest part of his army, took refuge in Syracuse…

5… 5 On the next day there occurred such an eclipse of the sun that utter darkness set in and the stars were seen everywhere;** wherefore Agathocles' men, believing that the prodigy portended misfortune for them, fell into even greater anxiety about the future…

18… This was the situation of affairs in Sicily and Libya.***

27 When Demetrius of Phalerum was archon in Athens, in Rome Quintus Fabius received the consulship for the second time and Gaius Marcius for the first…****

37 When Charinus was archon at Athens, the Romans gave the consulship to Publius Decius and Quintus Fabius;***** and in Elis the Olympian Games were celebrated for the one hundred and eighteenth time, at which celebration Apollonides of Tegea won the foot race…”

*) “Hieromnemon was archon in 310/09 B.C. In the Fasti the consuls of 311 B.C. are C. Iunius Bubulcus Brutus for the third time and Q. Aemilius Barbula for the second (CIL I, p130; cpLivy, 9.30.1). The narrative is continued from Book 19.110.5. For the first part of the African campaign, cpJustin, 22.4‑6; Orosius, 4.6.23‑29.

**) “August 15, 310 B.C., cp. Beloch, Griechische Geschichte2, 4.1.190. Calculations of the course of this eclipse indicate that Agathocles must have sailed north around Sicily (Cary in Cambridge Ancient History, 7.625).

***) “Continued in chap. 29.2.”

****) “Demetrius was archon in 309/8 B.C. In the Fasti the consuls for 310 B.C. are Q. Fabius Maximus Rullianus for the second time and C. Marcius Rutilus, who was later called Censorinus. Cp. Livy, 9.33. The narrative is continued from chap. 21.

*****) “Charinus was archon in 308/7 B.C. In the Fasti the year 309 B.C. is a "dictator year" with L. Papirius Cursor as dictator as C. Junius Bubulcus Brutus as his master-of‑horse. No consuls are given. For these dictator years, probably invented to accommodate two systems of chronology, cp. Introduction to Vol. IX and H. Stuart Jones in Cambridge Ancient History, 7.321. This fictitious year is omitted by both Livy and Diodorus, and from this point on the Varronian chronology and that of Diodorus agree. The consuls for 308 B.C. are given in the Fasti as P. Decius Mus for the second time and Q. Fabius Maximus Rullianus for the third, cp. Livy, 9.40, 41.”

Diodorus Sicilus, Library of History, Book XX, with original editor’s footnotes.

Diodorus Sicilus, Library of History, Book XX, with original editor’s footnote.

For in the second year of the seventeenth Olympiad (as Herodotus says) Cyaxares was elected king by the Medes. But Ctesias the Cnidian, who was later than Herodotus, and lived about the time of Cyrus's expedition against his brother Artaxerxes, (for being then taken prisoner, for his skill ia physic, he was taken into the king's favour, and continued with, him in great honour and esteem for the space of seventeen years).

The historical library of Diodorus the Sicilian, Book II, p. 128.

Diodorus Siculus (80-20BC) (Library of History 2,47)

Diodorus Siculus (200 A.D.)

“Diodorus states that there was a solar eclipse in the third year of the 117th Olympiad, which must be the eclipse of 310 BC. This gives us a date of (mid-summer) 776 BC for the first year of the first Olympiad.* ”

*) "The Athletics of the Ancient Olympics: A Summary and Research Tool" by Kotynski, p.3 (Quote used with permission). For the calculation of the date, see Kotynski, p.3. For more information about the question of this date, see Kotynski.” [Original footnote]

(From BookRags)

“The Greek writer who comes next to Herodotus in the copiousness with which he treats Egyptian affairs is DIODORUS, who, like Herodotus, visited Egypt, and who also professed to draw his narrative from information furnished him by the priests. The Egyptian history of Diodorus is, however, so manifestly based on that of Herodotus, which it merely supplements to a certain extent, that we can scarcely suppose it to have been drawn quite independently from native sources. Rather we must regard him as taking Herodotus for his basis, and as endeavoring to fill out the sketch with which that writer had furnished his countrymen. Apparently [he] was wholly ignorant of the history of Manetho. It is remarkable that the additions which Diodorus makes to the scheme of Herodotus are in almost every instance worthless.”

(A manual of ancient history, from the earliest times to the fall of the Western empire, comprising the history of Chaldæa, Assyria, Babylonia, Lydia, Phœnicia, Syria, Judæa, Egypt, Carthage, Persia, Greece, Macedonia, Rome, and Parthia. By George Rawlinson, p. 75.)

“WAR WITH AGATHOCLES, B.C. 311 to 304. War begun by aggressions of Agathocles on Agrigentum. Victory of Hamilcar at the Himera, B. C. 310, followed by the siege of Syracuse. Resolution of Agathocles to transfer the war into Africa. He lands and burns his ships; is for some time successful, partly owing to the treachery of Bomilcar, but can not conquer Carthage.” Idem, p. 100

“Four Greek writers especially devoted a large share of their attention to the subject; and of these two remain to us entire, of the third we possess by far the greater portion, while the fourth exists only in an epitome. These writers are (a) HERODOTUS, who traces the history of the empire from its foundation to the year B.c. 479. His work is valuable, as he had travelled in Persia, and derived much of his information from Persian informants. But these informants were not always trustworthy…” Idem, p. 102

A [l]ist of the kings is given by Diodorus 1. Spartacus I., reigned from B.c. 438 to 431. 2. Seleucus, reigned fiom B.C. 431 to 427. 3. Satyrus I., reigned from B.C. 407 to 393. 4. Leucon, his son, reigned fiom B.C. 393 to 353. 5. Spartacus II., his son, reigned from B.C. 353 to 348. 6. Parysades I., his brother, reigned from B.c. 348 to 310. 7. Satyrus II., his son, reigned nine months. 8. Prytanis, his brother, was deposed by 9. Eumdeus, also his brother, who reigned five years, from B.c. 309 to 304…Idem, p. 176.

Quoting Karl Hagen:

“Olympiad 1,1 correlates to 776 BCE. We do not actually need to believe an actual festival was held on this date, but when Greek historians are writing in later times, they date their own events using this as the epoch. We can establish a precise correlation to the common era from a variety of different sources, but the most definitive comes from a passage in Diodorus, where he dates the year of a total solar eclipse to the reign of the Athenian archon Hieromnemon, which he also gives as Ol. 117,3. The only astronomically possible date for this event is August 15, 310 BCE, which fixes our epoch.

“One thing to be wary of with reckoning by Olympiad is that writers* calculated the start of the year by their local convention (spring, summer, winter, or fall). For example Ol. 1,1 correspond to Fall, 777 - Fall 776 BCE by Macedonian reckoning. Byzantine writers who use Olympiads take the year to begin on September 1.”

(Ref.: Hagen, Karl, The Ancient Greek Calendar)

*) Notice: As best I’ve been able to determine thus far - and please email me if you find a basis for correcting me! - Josephus is reckoning the Olympic year as beginning July 1. That is, Josephus’ default calendar is the Scriptural calendar, with the Scriptural calendar year beginning with Tishri 22, that is, the Eighth Day Feast, and Josephus is not mixing up the beginning of one calendar with that of another!