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Bodhastra
Your birth date

Date-only systems resolve immediately. Systems that require a birth time or place will say so instead of guessing.

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The Graves tree calendar: a living modern reconstruction, kept distinct from ancient ogham evidence.

Beth-Luis-Nion · thirteen trees · one modern reconstruction

The tree calendar has an author

Robert Graves constructed this thirteen-month scheme in The White Goddess (1948). It became a living modern Pagan calendar. It is not an ancient Celtic zodiac recovered from ogham stones.

The thirteen tree months

Real ogham, invented calendar

Ogham inscriptions are real early Irish writing, mainly surviving on fourth- to sixth-century stones. Medieval scholars also recorded letter names and plant glosses.

Neither body of evidence turns thirteen letters into birth months. Graves selected and reordered material into a poetic calendar. Separate the evidence layers →

A calculator for the modern version

The calculator implements the popular fixed Gregorian ranges derived from thirteen 28-day months. It leaves 23 December outside every tree rather than hiding the intercalary day. Find the modern tree sign →

Bodhastra documents what astrological traditions have said, and when they started saying it. It is presented as cultural history and entertainment. Nothing here is medical, psychological, financial or predictive advice, and nothing here is a claim about what will happen to you.

Every source, listed

Place data from GeoNames, used under CC BY 4.0.