CELTIC TREE
CALENDER
| CELTIC NAME | ENGLISH NAME | LETTER | DATE |
| BETH | Birch | B | December 24 - January 20 |
| LUIS | Rowan | L | January 21 - February 17 |
| NION | Ash | N | February 18 - March |
| FEARN | Alder | F | March 18 - April 14 |
| SAILLE | Willow | S | April 15 - May 12 |
| UATH | Hawthorn | H | May 15 - June 9 |
| DUIR | Oak | D | June 10 - July 7 |
| TINNE | Holly | T | July 8 - August 4 |
| COLL | Hazel | C | August 5 - September 1 |
| MUIN | Vine | M | September 2 - September 29 |
| GORT | Ivy | G | September 30 - October 27 |
| PETHBOC | Dwarf Elder | P | October 28 - November 24 |
| RUIS | Elder | R | November 25 - December 22 |
| AILM | Silver Fir | A | Winter Solstice - The First Day of the Year |
| ONN | Furze | O | Spring Equinox |
| UR | Heather | U | Summer Solstice |
| EADHA | White Poplar | E | Autumn Equinox |
| IDHO | Yew | I | Eve of the Winter Solstice - The Last Day of the Year |