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| Namespace | Identifier | Authority | Name | Constants |
|---|---|---|---|---|
| Armenian | Armenian Calendar | |||
| Assyrian | Assyrian Calendar | |||
| Attic | Attic Calendar | |||
| Aztec | Aztec Calendar | |||
| Babylonian | Babylonian Calendar | |||
| Boeotian | Boeotian Calendar | |||
| Bulgar | Bulgar Calendar | |||
| Byzantine | Byzantine Calendar | |||
| Coligny | Coligny Calendar | |||
| Cretan | Cretan Calendar | |||
| Delphic | Delphic Calendar | |||
| Egyptian | Egyptian Calendar | |||
| Epirotic | Epirotic Calendar | |||
| Enoch | Enoch Calendar | |||
| Florentine | Florentine Calendar | |||
| FrenchRepublican | French Republican Calendar | |||
| Germanic | Germanic Calendar | |||
| Gaelic | Gaelic Calendar | |||
| Laconian | Laconian Calendar | |||
| Lithuanian | Lithuanian Calendar |
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| Macedonian | Ancient Macedonian Calendar |
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| Maya | Maya Calendar |
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| Minguo | Minguo Calendar |
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| Pentecontad | Pentecontad Calendar |
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| RapaNui | Rapa Nui Calendar |
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calendar:RapaNui@okapia.net
Rhodian Calendar
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| Rhodian | Rhodian Calendar | |||
| Roman | Roman Calendar | |||
| Runic Calendar | Runic | |||
Roman Calendar
calendar:Roman@okapia.net
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