Celtic Year Calendar. But to allow that order to be psychologically comfortable, the celts knew that there had to be a time when order and. By adopting a tree calendar, you are creating a way for a culture to align itself with the rhythms of the environment and link to folklore.

The celtic tree calendar is a calendar with thirteen lunar divisions inspired by ancient celtic and druidic traditions. Based on the ’celtic tree calendar’, as devised by robert graves in his book ‘the white goddess’, there are 13 months to loosely correspond with the ancient celtic lunar calendar.