Liber ab Luna (The Book of the Moon)^165
The Celtic Tree Calendar at a Glance (Theory 1—Least Accurate)
Month Tree Gregorian Start Gregorian End Ogham Letter
Beth/Beith Birch December 24 January 20 B
Luis Rowan January 21 February 17 L
(Mtn. Ash)
Nion/Nuin Ash February 18 March 17 N
Fearn Alder March 18 April 14 F
Saille Willow April 15 May 12 S
Huath Hawthorn May 13 June 9 H
Duir Oak June 10 July 17 D
Tinne Holly July 18 August 4 T
Coll Hazel August 5 September 1 C
Quert/Muin Apple/ September 2 September 29 Q
Vine (grape)
Gort Ivy September 30 October 27 G
Ngeatal Broom/Reed October 28 November 24 Ng
Ruis Elder November 25 December 21 R
Quarter Days:
Day Tree Quarter Day App. Gregorian Ogham Letter
Onn Gorse Spring Equinox March 21 O
Ura Heather Summer Solstice June 21 U
Eadha Aspen Autumn Equinox September 21 E
Idho Yew Winter Solstice December 21 I
Additional days of note:
Day Tree Quarter Day App. Gregorian Ogham Letter
Straif Blackthorn (Sloe) Samhain October 31 Ss
Alim Pine Last day of year December 23 A
Phagos Beech All except December 23 Ph
q WB Chap 09.p65 165 7/11/2003, 5:53 PM