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Hicetas (Ancient Greek: Ἱκέτας or Ἱκέτης; c. 400 – c. 335 BC) was a Greek philosopher of the Pythagorean School. He was born in Syracuse. Like his fellow Pythagorean Ecphantus and the Academic Heraclides Ponticus, he believed that the daily movement of permanent stars was caused by the rotation of the Earth around its axis.[1] When Copernicus referred to Nicetus Syracusanus (Nicetus of Syracuse) in De revolutionibus orbium coelestium as having been cited by Cicero as an ancient who also argued that the earth moved, it is believed that he was actually referring to Hicetus.[2]


  1. Theophrastus ap Cicero, Acad. Quaest. ii. 39. Diogenes Laërtius (viii. 85) says that some ascribed this doctrine to Hicetas, while others attributed it to Philolaus.
  2. W. T. Lynn, "Nicetus of Syracuse" in The Observatory Vol. 16 (1893) pp. 380-381