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The Hellene year has either 12 or 13 months, depending on whether it is a common year or a leap year.
The 12 months of a common year are as follows (alternate names, mostly Makedonian, may be found in the Glossary, which also contains an explanation of year lengths):
N.B. Events that are celebrated in Poseideon II in a leap year are celebrated in Poseideon in a common year.
| Number | Name | Length in 354-Day Year | Length in 355-Day Year |
| 1 | Boedromion | 30 | 30 |
| 2 | Pyanepsion | 29 | 29 |
| 3 | Maimakterion | 30 | 30 |
| 4 | Poseideon | 29 | 29 |
| 5 | Gamelion | 30 | 30 |
| 6 | Anthesterion | 29 | 29 |
| 7 | Elaphebolion | 30 | 30 |
| 8 | Mounykhion | 29 | 29 |
| 9 | Thargelion | 30 | 30 |
| 10 | Skirophorion | 29 | 29 |
| 11 | Hekatombaion | 30 | 30 |
| 12 | Metageitnion | 29 | 30 |
The 13 months of a leap year are as follows (alternate names, mostly Makedonian, may be found in the Glossary, which also contains an explanation of year lengths):
N.B. Events that are celebrated in Poseideon in a common year are celebrated in Poseideon II in a leap year.
| Number | Name | Length in a 383-Day Year | Length in a 384-Day Year |
| 1 | Boedromion | 30 | 30 |
| 2 | Pyanepsion | 29 | 29 |
| 3 | Maimakterion | 30 | 30 |
| 4 | Poseideon | 29 | 29 |
| 13 | Poseideon II | 29 | 30 |
| 5 | Gamelion | 30 | 30 |
| 6 | Anthesterion | 29 | 29 |
| 7 | Elaphebolion | 30 | 30 |
| 8 | Mounykhion | 29 | 29 |
| 9 | Thargelion | 30 | 30 |
| 10 | Skirophorion | 29 | 29 |
| 11 | Hekatombaion | 30 | 30 |
| 12 | Metageitnion | 29 | 29 |
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