Attic calendar in the context of "Athena"

Various ancient Greek calendars began in most states of ancient Greece between autumn and winter except for the Attic calendar, which began in summer.

The Greeks, as early as the time of Homer, appear to have been familiar with the division of the year into the twelve lunar months but no intercalary month Embolimos or day is then mentioned, with twelve months of 354 days. Independent of the division of a month into days, it was divided into periods according to the increase and decrease of the moon. Each of the city-states in ancient Greece had their own calendar that was based on the cycle of the moon, but also the various religious festivals that occurred throughout the year.

The Lenaia (Ancient Greek: Λήναια) was an annual Athenian festival with a dramatic competition. It was one of the lesser festivals of Athens and Ionia in ancient Greece. The Lenaia took place in Athens in Gamelion, roughly corresponding to January. The festival was in honour of Dionysus Lenaios. There is also evidence the festival also took place in Delphi.

The term Lenaia probably comes from "lenos" 'wine-press' or from "lenai", another name for the Maenads (the female worshippers of Dionysus).

Meton of Athens (Greek: Μέτων ὁ Ἀθηναῖος; gen.: Μέτωνος) was a Greek mathematician, astronomer, geometer, and engineer who lived in Athens in the 5th century BC. He is best known for calculations involving the eponymous 19-year Metonic cycle, which he introduced in 432 BC into the lunisolar Attic calendar. Euphronios says that Colonus was Meton's deme.

In ancient Greek religion and mythology, Cronus, Cronos, or Kronos (/ˈkroʊnəs/ or /ˈkroʊnɒs/; Ancient Greek: Κρόνος) was the leader and youngest of the Titans, the children of Gaia (Earth) and Uranus (Sky). He overthrew his father and ruled during the mythological Golden Age until he was overthrown by his son Zeus and imprisoned in Tartarus. According to Plato, however, the deities Phorcys, Cronus, and Rhea were the eldest children of Oceanus and Tethys.

Cronus was usually depicted with a harpe, scythe, or sickle, which was the instrument he used to castrate and depose Uranus, his father. Cronus was likely originally a harvest god, which is why in many regions of Greece the month of the harvest was named Cronion after him. In Athens, on the twelfth day of the Attic month of Hekatombaion, a festival called Kronia was held in honour of Cronus to celebrate the harvest, suggesting that, as a result of his association with the virtuous Golden Age, Cronus continued to preside as a patron of the harvest. Cronus was also identified in classical antiquity with the Roman deity Saturn.

The festival calendar of Classical Athens involved the staging of many festivals each year. This includes festivals held in honor of Athena, Dionysus, Apollo, Artemis, Demeter, Persephone, Hermes, and Heracles. Other Athenian festivals were based around family, citizenship, sacrifice, and women. There were at least 120 festival days each year.

The Panathenaea (or Panathenaia) was a multi-day ancient Greek festival held annually in Athens that would always conclude on 28 Hekatombaion, the first month of the Attic calendar. The main purpose of the festival was for Athenians and non-Athenians to celebrate the goddess Athena. Every four years, the festival was celebrated in a larger manner over a longer time period with increased festivities and was known as the Great (or Greater) Panathenaea. In the years that the festival occurred that were not considered the Great Panathenaea, the festival was known as the Lesser Panathenaea. The festival consisted of various competitions and ceremonies, culminating with a religious procession that ended in the Acropolis of Athens.