The Celtic Tree Calendar is a 13 month calendar meintioned by Robert Graves in his book The White Goddess. Each month is named after a Tree and has a Rune associated with it. In addition to the 13 months, there is an extra day to bring the number of days up to 365. There is no mention of any leap year rule, even though such must exist for the months to occur (approximately) on their equivalent Gregorian dates (as shown next). The months are The calendar is used a by neopagans, but there is no record of historical use.
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