The Collaborative International Dictionary
Greek calendar \Greek calendar\
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Any of various calendars used by the ancient Greek states.
Note: The Attic calendar divided the year into twelve months of 29 and 30 days, as follows: 1. Hecatomb[ae]on (July-Aug.).
Metageitnion (Aug.-Sept.).
Bo["e]dromion (Sept.-Oct.).
Pyanepsion (Oct.-Nov.).
M[ae]macterion (Nov.-Dec.).
Poseideon (Dec.-Jan.).
Gamelion (Jan.-Feb.).
Anthesterion (Feb.-Mar.).
Elaphebolion (Mar.-Apr.).
Munychion (Apr.-May).
Thargelion (May-June).
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Scirophorion (June-July). A fixed relation to the seasons was maintained by introducing an intercalary month, ``the second Poseideon,'' at first in an inexact way, afterward in years 3, 5, 8, 11, 13, 16, 19 of the Metonic cycle. Dates were reckoned in Olympiads.
2. The Julian calendar, used in the Greek Church.
Wikipedia
The Attic calendar is the calendar that was in use in ancient Attica, the ancestral territory of the Athenian polis. This article focuses on the 5th and 4th centuries BC, the classical period that produced some of the most significant works of ancient Greek literature. Because of the relative wealth of evidence from Athens, it is the best understood of all the Hellenic calendars. Viewed from the standpoint of the modern Gregorian calendar, the ancient system has many peculiar features, which is a part of its appeal: as a cultural artifact, it opens a window to the mentality of its users.
Although relatively abundant, the evidence for the Attic calendar is still patchy and often contested. As it was obvious to ancient Athenians, no contemporary source set out to describe the system as a whole. Further, during the period in question the calendar underwent changes, not all perfectly understood. As such, any account given of it must be a tentative reconstruction. In this context, the terms Athenian and Attic are largely interchangeable.