Heraclides of Pontus was a Greek Academic philosopher and astronomer of the fourth century BC. A pupil of Plato, Speusippus, and Aristotle, he wrote extensively on ethics, natural philosophy, astronomy, literature, rhetoric, music, and history. He is especially associated with the proposal that Earth rotates daily on its axis.
Background
Heraclides was born in Heraclea Pontica, a Greek city on the southern coast of the Black Sea, now Karadeniz Ereğli in Turkey. His father, Euthyphron, belonged to a wealthy and prominent local family said to descend from one of the city's founders.
His life unfolded during the fourth century BC, when Heraclea Pontica was part of the wider Greek intellectual and political world of the Black Sea region. Ancient accounts associate him with the city's political troubles and report that he later returned there after his unsuccessful candidacy to lead Plato's Academy.
Education
Heraclides studied at Plato's Academy in Athens, first associating with Speusippus and later studying with Plato and Aristotle. The Academy, founded by Plato in the early fourth century BC, was one of the most important philosophical communities of classical Greece and pursued dialectical, ethical, mathematical, and natural-philosophical inquiry.
His education brought him into contact with competing strands of classical philosophy. He remained associated with the Academic tradition, while his engagement with Aristotelian and Pythagorean ideas contributed to the broad range of subjects addressed in his writings.
Career
Heraclides was a philosopher and writer associated with Plato's Academy. During Plato's third visit to Sicily, around 361–360 BC, he was placed temporarily in charge of the Academy. After the death of Speusippus, he was a candidate to succeed him as head of the school, but Xenocrates was chosen, and Heraclides returned to Heraclea Pontica.
He wrote dialogues and treatises on ethics, politics, natural philosophy, astronomy, literary criticism, rhetoric, music, history, and the history of philosophy. His works were widely discussed in antiquity, but they survive only in fragments and reports preserved by later authors.
Heraclides' astronomical theories challenged the prevailing assumption that the heavens alone moved around a stationary Earth. He proposed that the apparent daily revolution of the fixed stars could be explained by Earth's rotation on its axis. Ancient evidence also connects him with theories concerning the motions of Venus and Mercury, although the precise scope of those proposals remains disputed.
Achievements
Heraclides proposed that the apparent daily revolution of the fixed stars was caused by the actual daily rotation of Earth on its axis, an important early departure from a strictly stationary-Earth model of the heavens.
Heraclides developed astronomical explanations for the motions of Venus and Mercury; the exact form and extent of these theories remain debated because his original writings are lost.
He produced a large body of philosophical and literary writing on ethics, politics, natural philosophy, astronomy, rhetoric, music, history, and literary criticism, influencing the ancient reception of Academic philosophy despite the survival of only fragments.
Works
dialogue
On Justice
(An ethical dialogue attributed to Heraclides and reported...)
history
On the Pythagoreans
(A historical work on Pythagorean thinkers attributed to H...)
literary criticism
Solutions of Homeric Problems
(A two-book work on Homeric interpretation attributed to H...)
rhetorical work
On Public Speaking, or Protagoras
(A rhetorical work attributed to Heraclides and identified...)
treatise
On the Soul
(A philosophical work attributed to Heraclides and include...)
On Celestial Phenomena
(A work on astronomy attributed to Heraclides and associat...)
On Music
(A two-book work on music attributed to Heraclides and pre...)
On Nature
(A natural-philosophical treatise attributed to Heraclides...)
Views
Heraclides belonged to the Academic philosophical tradition associated with Plato, but his interests extended across ethics, politics, natural philosophy, astronomy, literature, rhetoric, music, and history. His surviving fragments indicate a philosophical method that used dialogue, literary presentation, and engagement with earlier thinkers.
In astronomy, he argued that Earth's rotation could account for the apparent daily movement of the celestial sphere. This was a significant departure from the assumption that the fixed stars revolved around an immobile Earth. Claims that he fully endorsed a heliocentric planetary system remain contested, although ancient reports associate him with theories placing the motions of Venus and Mercury in relation to the Sun.
Personality
Ancient accounts describe Heraclides as mild and dignified in appearance. They also portray him as wealthy, elaborately dressed, and notably corpulent, leading Athenians to use the punning nickname "Pompicus" in place of "Ponticus."
Physical Characteristics:
Ancient biographical reports describe Heraclides as extremely corpulent and dignified in appearance.
Interests
Ethics, astronomy, natural philosophy, literature, rhetoric, music, history, and political theory
Philosophers & Thinkers
Plato; Aristotle; Speusippus
Connections
Heraclides was the son of Euthyphron, a wealthy and prominent citizen of Heraclea Pontica. His intellectual connections included Plato, Speusippus, Aristotle, and the wider Academic community in Athens.
Father:
Euthyphron
A wealthy and prominent citizen of Heraclea Pontica and the father of Heraclides.
Heraclides (1) Ponticus, philosopher, 4th cent. BCE
An Oxford Classical Dictionary reference entry discussing Heraclides' Academic affiliations, education, leadership of the Academy, writings, and intellectual interests.
2016
Heraclides of Pontus (4th century BC)
A Routledge Encyclopedia of Philosophy article examining Heraclides as a pupil of Plato and author of works on moral, religious, cosmological, and physical subjects.
