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The Celtic Tree Zodiac originates in the work of Robert Graves, an English author. Besides being a Celtic scholar, he was also a renowned Classicist (scholar of the ancient Mediterranean). In 1948 he published his famous essay, The White Goddess. In this book he argues that the Ogham letters contained a secret key- the Celtic Tree Calendar.
While it is true that some of the names of Ogham letters translated to tree-related words such as birch, alder, and pine, this all had nothing to do with any sort of Celtic calendar, nor did it have anything to do with astrology.
The following articles provide much more in-depth information:
The Fabrication of 'Celtic' Astrology and Desecrating Graves
