Heraclian Calendar (Imperium Islamica)

The Heraclian Calendar was a system adopted by after the Islamization of the Byzantine Empire. Finding the Julian calendar satisfactory, Heraclius set Muhammed's Hijra as Year 1 and with zodiac symbols as determining years. Each month corresponds with a zodiac symbol. The system is more accurate than the Julian calendar in use in Christian countries and, as a result, it is the main calendar in use.

Months
The months are taken from the Attic Calendar. They are the following:
 * 1) Hekatombaion - Εκατομβαιών
 * 2) Metageitnion - Μεταγειτνιών
 * 3) Boedromion - Βοηδρομιών
 * 4) Pyanepsion - lΠυανεψιών
 * 5) Maimakterion - Μαιμακτηριών
 * 6) Poseideon - Ποσειδεών
 * 7) Gamelion - Γαμηλιών
 * 8) Anthesterion - Ανθεστηριών
 * 9) Elaphebolion - Ελαφηβολιών
 * 10) Mounichion - Μουνιχιώ
 * 11) Thargelion - Θαργηλιών
 * 12) Skirophorion - Σκιροφοριών