The eclipse of Thales was a solar eclipse that was, according to ancient Greek historian Herodotus, accurately predicted by the Greek philosopher Thales of Miletus. If Herodotus' account is accurate, this eclipse is the earliest recorded as being known in advance of its occurrence. Many historians believe that the predicted eclipse was the solar eclipse of 28 May 585 BC. [1] [2] How exactly Thales predicted the eclipse remains uncertain; some scholars assert the eclipse was never predicted at all. [3] [4] [5] Others have argued for different dates, [6] but only the eclipse of May 585 BC matches the conditions of visibility necessary to explain the historical event. [7]
According to Herodotus, the appearance of the eclipse was interpreted as an omen, and interrupted a battle in a long-standing war between the Medes and the Lydians. American writer Isaac Asimov described this battle as the earliest historical event whose date is known with precision to the day, and called the prediction "the birth of science". [8]
The eclipse peaked over the Atlantic Ocean at 37°54′N46°12′W / 37.9°N 46.2°W and the umbral path reached south-western Anatolia in the evening hours. The Halys River, the presumed site of the battle mentioned by Herodotus, is just within the error margin for ΔT provided. [2]
Herodotus' The Histories 1.73–74 states that a war started in that period between the Medes and the Lydians.
Another combat took place in the sixth year, in the course of which, just as the battle was growing warm, day was on a sudden changed into night. This event had been foretold by Thales, the Milesian, who forewarned the Ionians of it, fixing for it the very year in which it actually took place. The Medes and Lydians, when they observed the change, ceased fighting, and were alike anxious to have terms of peace agreed on. [9]
While doubt has been cast on the truth of the story, there are other accounts of it besides that of Herodotus. Diogenes Laërtius says that Xenophanes, who lived in the same century as Thales, was impressed with the prediction, and he also gives additional testimonies from the pre-Socratics Democritus and Heraclitus. [6]
Cicero mentions that Thales was the first man to successfully predict a solar eclipse during the reign of Astyages, the last king of the Median empire. [10] Pliny the Elder mentions as well that Thales had predicted a solar eclipse during the reign of Alyattes of Lydia. [11]
At the time of Thales' purported prediction it was not yet known that eclipses were caused by the Moon coming between the Earth and the Sun, a fact that would not be discovered until over a century later by either Anaxagoras or Empedocles. [12]
If the account is true, it has been suggested that Thales would have had to calculate the timing of any eclipse by recognizing patterns in the periodicities of eclipses. [6]
It has been postulated that Thales may have used the Saros cycle in his determination, or that he may have had some knowledge of Babylonian astronomy. However, Babylonians were far from being able to predict the local conditions of solar eclipses at that point, which makes this hypothesis highly unlikely. [4] [13] At the time, there was no known cycle that could be reliably used to predict an eclipse for a given location and, therefore, any accurate prediction would have been down to luck. [5] [6]
Alyattes, sometimes described as Alyattes I, was the fourth king of the Mermnad dynasty in Lydia, the son of Sadyattes, grandson of Ardys, and great-grandson of Gyges. He died after a reign of 57 years and was succeeded by his son Croesus.
Hipparchus was a Greek astronomer, geographer, and mathematician. He is considered the founder of trigonometry, but is most famous for his incidental discovery of the precession of the equinoxes. Hipparchus was born in Nicaea, Bithynia, and probably died on the island of Rhodes, Greece. He is known to have been a working astronomer between 162 and 127 BC.
Lydia was an Iron Age kingdom situated in the west of Asia Minor, in modern-day Turkey. The ethnic group inhabiting this kingdom are known as the Lydians, and their language as Lydian and their capital was Sardis.
Thales of Miletus was an Ancient Greek pre-Socratic philosopher from Miletus in Ionia, Asia Minor. Thales was one of the Seven Sages, founding figures of Ancient Greece.
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This article concerns the period 589 BC – 580 BC.
The year 585 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 169 Ab urbe condita. The denomination 585 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.
Croesus was the king of Lydia, who reigned from 585 BC until his defeat by the Persian king Cyrus the Great in 547 or 546 BC. According to Herodotus, he reigned 14 years. Croesus was renowned for his wealth; Herodotus and Pausanias noted that his gifts were preserved at Delphi. The fall of Croesus had a profound effect on the Greeks, providing a fixed point in their calendar. "By the fifth century at least", J. A. S. Evans has remarked, "Croesus had become a figure of myth, who stood outside the conventional restraints of chronology."
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The Battle of Pteria was fought in 547 BC between the Persian forces of Cyrus the Great and the Lydian forces of Croesus. Both armies suffered heavy casualties in this indecisive battle.
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Babylonian astronomy was the study or recording of celestial objects during the early history of Mesopotamia. The numeral system used, sexagesimal, was based on sixty, as opposed to ten in the modern decimal system. This system simplified the calculating and recording of unusually great and small numbers.
A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby obscuring the view of the Sun from a small part of Earth, totally or partially. Such an alignment occurs approximately every six months, during the eclipse season in its new moon phase, when the Moon's orbital plane is closest to the plane of Earth's orbit. In a total eclipse, the disk of the Sun is fully obscured by the Moon. In partial and annular eclipses, only part of the Sun is obscured. Unlike a lunar eclipse, which may be viewed from anywhere on the night side of Earth, a solar eclipse can only be viewed from a relatively small area of the world. As such, although total solar eclipses occur somewhere on Earth every 18 months on average, they recur at any given place only once every 360 to 410 years.
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The Kingdom of Cilicia was an independent state that existed from 612 BC to 549 BC. The state was governed by the Syennesis dynasty, possibly from Greeks that moved into Cilicia towards the end of the Bronze Age. Prior to and after the independent kingdom, the Syennesis dynasty ruled Cilicia as autonomous state under the Neo-Assyrian Empire and the Achaemenid Empire.
The Medo-Persian conflict was a military campaign led by the Median king Astyages against Persis in the mid 6th-century BCE. Classical sources claim that Persis had been a vassal of the Median kingdom that revolted against Median rule, but this is not confirmed by contemporary evidence. After some battles the Persians led by Cyrus the Great emerged victorious, subsequently conquering Median territories and establishing the Achaemenid Empire.
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Patricia F. O'Grady is an Australian historian of philosophy specializing in ancient Greek philosophy and in particular on Thales of Miletus. She earned a doctorate in 1998 at Flinders University, with the dissertation Thales: Some Problems in Early Greek Science and Philosophy.
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