The Celtic Tree Calendar is a calendar with thirteen lunar divisions. Most contemporary Pagans use fixed dates for each "month", rather than following the waxing and waning lunar cycle. If this was done, eventually the calendar would fall out of sync with the Gregorian year, because some calendar years have 12 full moons and others have 13. The modern tree calendar is based on a concept that each letter in the ancient Celtic alphabet corresponded to a tree.
Trees
- Birch, 1st Moon of the Celtic Year - (Dec 24 - Jan 21)
- Rowan, 2nd Moon of the Celtic Year - (Jan 22 - Feb 18)
- Ash, 3rd Moon of the Celtic Year - (Feb 18 - March 17)
- Alder, 4th Moon of the Celtic Year - (March 18 - April 14)
- Willow, 5th Moon of the Celtic Year - (April 15 - May 12)
- Hawthorn, 6th Moon of the Celtic Year - (May 13 - June 9)
- Oak, 7th Moon of the Celtic Year - (June 10 - July 7)
- Holly, 8th Moon of the Celtic Year - (July 8 - Aug 4)
- Hazel, 9th Moon of the Celtic Year - (Aug 5 - Sept 1)
- Vine, 10th Moon of the Celtic Year - (Sept 2 - Sept 29)
- Ivy, 11th Moon of the Celtic Year - (Sept 30 - Oct 27)
- Reed, 12th Moon of the Celtic Year - (Oct 28 - Nov 24)
- Elder, 13th Moon of the Celtic Year - (Nov 25 - Dec 23)
- Furze, Tree of the Spring Equinox (Aprox. March 20)
- Heather, Tree of the Summer Solstice (Aprox. June 20)
- Poplar, Tree of the Fall Equinox - (Aprox. September 22)
- Yew, Tree of the day before the Winter Solstice (Aprox. December 21)
- Fir, Tree of the day of the Winter Solstice
- Mistletoe, Tree of the day after the Winter Solstice (Aprox. December 23)
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