Dionysius of Cyrene

Dionysius of Cyrene (Ancient Greek: Διονύσιος ὁ Κυρηναῖος), lived c. 150 BC, was a Stoic philosopher and mathematician.

He was a pupil of Diogenes of Babylon and Antipater of Tarsus.

He was famed as a mathematician, and he is probably the Dionysius whose arguments are attacked by Philodemus in his book On Signs (Latin: De Signis),^[1] where Dionysius is reported as arguing that the Sun must be very large because it reappears slowly from behind an obstruction.^[2]