Seleucus of Seleucia: The Ancient Astronomer Who Believed In Heliocentrism

Seleucus of Seleucia was among the archetypal to reason for heliocentrism, supporting Aristarchus’ exemplary of the Sun-centered universe. Credit: Wikimedia Commons, CC BY 4.0

Seleucus of Seleucia was a Hellenistic astronomer, mathematician, and physicist from Seleucia connected the Tigris who is champion known for his staunch defence of the heliocentric theory, projected by Aristarchus of Samos, arsenic good arsenic his studies connected the causes of tides. While nary of his archetypal writings survive, aboriginal past authors notation his contributions, confirming his relation arsenic 1 of antiquity’s astir forward-thinking scientists.

Seleucus of Seleucia: An advocator of heliocentrism

Seleucus lived during the tallness of Hellenistic technological advancements, erstwhile Greek, Babylonian, and Indian cognition converged. We hint his intelligence lineage backmost to the affluent astronomical traditions of the Babylonians, who meticulously recorded celestial events for centuries. The Greek historiographer and geographer Strabo referred to him arsenic a “Chaldean,” a word that successful past times denoted Babylonian astronomers.

Seleucus of Seleucia is 1 of the past astronomers known to person explicitly defended the Greek astronomer Aristarchus’ heliocentric theory. He argued that the Earth orbits the Sun portion rotating connected its axis. Aristarchus projected this thought astir the 3rd period BC. However, the Greek astronomer Ptolemy’s geocentric exemplary dominated subject for a millennium. Seleucus supported Aristarchus’ exemplary and attempted to beryllium it done logical reasoning and mathematical calculations.

One of the superior sources mentioning Seleucus’s defence of heliocentrism is the Greek historiographer Plutarch. In his enactment “On the Face successful the Moon’s Orb” (De Facie successful Orbe Lunae), Plutarch states:

“Seleucus demonstrated the information of the proposal of Aristarchus.”

Although Plutarch does not specify however Seleucus proved the heliocentric model, helium mightiness person utilized observational evidence, specified arsenic the evident question of planets and the behaviour of tides, to reason for a rotating Earth.

Studies of Seleucus connected tides

Apart from his astronomical work, Seleucus made important contributions to knowing tides. He was the archetypal idiosyncratic known to correctly hypothesize that the Moon’s power caused the tides and that their saltation depended connected the Moon’s presumption comparative to the Sun.

Strabo, the Greek geographer, acknowledges Seleucus’ contributions successful his Geography:

“Seleucus the mathematician attributes the improvement of the tides to the Moon and states that their tallness varies with its presumption comparative to the Sun.”

This mentation was remarkably precocious for its time. It linked celestial mechanics with Earth’s earthy phenomena. This conception would not beryllium afloat understood until the 17th period and British physicist Isaac Newton’s gravity experiments.

Cellarius’s illustration illustrating Copernicus’ heliocentric exemplary of the universe, based connected Aristarchus’ mentation that Seleucus accepted. Credit: Lawrence Ruderman Antique Maps, Wikimedia Commons, Public Domain

Scientific theories of Seleucus of Seleucia, the advocator of heliocentrism

Seleucus apt relied connected empirical observations and mathematical reasoning to enactment his claims. Some scholars, similar the Austrian-American Otto Neugebauer, speculate that helium mightiness person observed however h2o bodies behaved nether antithetic lunar phases. He noticed patterns that supported his lunar-tidal hypothesis. Furthermore, his advocacy of the heliocentric exemplary suggests that helium whitethorn person recognized retrograde question arsenic an illusion. He believed the Earth’s question was the origin alternatively than an inherent diagnostic of planetary motion.

His enactment demonstrated a beardown grasp of physics, astronomy, and geometry. This expertise made him 1 of the fewer past scientists to reason for a exemplary of the cosmos.

Apart from Heliocentrism, Seleucus of Seleucia believed successful the infinity of the universe. Credits: Public Domain, via Wikimedia Commons.

Legacy and Impact of Seleucus of Seleucia

Despite his important contributions, Seleucus’ enactment was not wide accepted during the Middle Ages. The ascendant geocentric model, championed by Aristotle and aboriginal formalized by Claudius Ptolemy successful the Almagest, remained the prevailing cosmological model until the Copernican Revolution successful the 16th century.

However, the rediscovery of heliocentrism and the acknowledgment of its past proponents, including Aristarchus and Seleucus, item the continuity of technological thought crossed millennia. Modern scholars similar the Italian Lucio Russo respect Seleucus arsenic 1 of the earliest defenders of a heliocentric beingness and the archetypal to suggest a carnal mechanics for tides.

Seleucus of Seleucia is simply a singular fig successful past science, bridging the intelligence traditions of Babylon and Greece. His bold enactment for heliocentrism and innovative tidal studies exemplify the extent of technological enquiry successful the Hellenistic period. Although his works person been lost, references to his ideas successful past texts corroborate his presumption arsenic a pioneering thinker. Additionally, his insights anticipated galore principles of modern astronomy and physics.