Andronicus of Cyrrhus was a Greekastronomer who flourished about 100 BC.
He built a horologium at Athens, the so-called Tower of the Winds, a considerable portion of which still exists. It is octagonal, with figures carved on each side, representing the eight principal winds. In antiquity a bronze figure of Triton on the summit, with a rod in his hand, turned round by the wind, pointed to the quarter from which it blew. From this model is derived the custom of placing weathercocks on steeples.
A native of the Syrian city of Cyrrhus, Andronicus is cited by Pausanias, Vitruvius and Varro.
This sundial became so famous that Andronicus was invited to Athens, where he erected a magnificent horologium on the eastern side of the Roman marketplace.
Andronicus incorporated into this construction a number of inventions of earlier clock-makers, including Archimedes, Ctesibius and Philo.