Celtic Calendar

The earliest surviving Celtic calendar is believed to date from the 1st century BC and was found in Gaul. The 'Coligny Calendar' is a lunar calendar engraved on bronze plates. Interestingly, the months marked on it begin at the full moon, rather than the new moon, and a month is divided into a ‘light’ and ‘dark’ half lasting around two weeks each. When viewed as a whole, the Coligny Calendar spans around 30 years, which some historians think may have been the lifetime of its creator.