Phidias is also reportedly the overall supervisor of the artistic works on the Acropolis, including the (lost) “Athena Promachos.”

The Parthenon is completed in 432.

Iktinos has employed fine Pentelic marble throughout the Parthenon, incorporating every refinement developed by Greek architects over the previous two centuries to produce an unparalleled harmony of geometric proportions, optical effects, and sculptural decoration.

The acroteria (pediment plinths) feature the first known occurrence of the acanthus leaf, an architectural element based on the leaves of the acanthus plant.

Callimachus of Athens according to Vitruvius is the first to use the acanthus leaf on the new Corinthian capital design.

The frieze of the Erechtheum features acanthus leaves as a design element.

Athenian astronomer Meton, who flourishes during the later half of the fifth century BCE, discovers a nineteen-year lunisolar calendric cycle of six thousand nine hundred and forty days (nineteen solar years), finding it to be be almost equivalent to two hundred and thirty-five lunar (synodic) months.

The Greeks in 432, following the acceptance of Meton’s discovery, add a thirteenth intercalary month to their calendar, which normally consists of twelve lunar months (three hundred and fifty-four days).