Horologion of Andronikos Cyrrhestes

The Horologion of Andronikos Cyrrhestes is an octagonal tower made of Pentelic marble that stands in the Roman Agora. You can identify the structure by the eight large reliefs near its roof, each depicting a personified wind god such as Boreas or Zephyrus. Built in the first century before the common era by an astronomer from Macedonia, the building functioned as an advanced timekeeping and meteorological station. It featured sundials on its exterior walls and an interior water clock to track time when the sun was not shining.