Source : Webster's Revised Unabridged Dictionary (1913)

Greek calendar \Greek calendar\
   1. 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.). 2. Metageitnion (Aug.-Sept.). 3.
         Bo["e]dromion (Sept.-Oct.). 4. Pyanepsion (Oct.-Nov.).
         5. M[ae]macterion (Nov.-Dec.). 6. Poseideon
         (Dec.-Jan.). 7. Gamelion (Jan.-Feb.). 8. Anthesterion
         (Feb.-Mar.). 9. Elaphebolion (Mar.-Apr.). 10. Munychion
         (Apr.-May). 11. Thargelion (May-June). 12. 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.