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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.

Traditions to include

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

Facts & origins · calculator contract

There is no single tree-zodiac table

Later popular systems add trees, isolate solstices and equinoxes, or move boundaries. A calculator must choose and name one.

The version used here

Bodhastra follows the Graves-derived thirteen-by-twenty-eight-day sequence from Birch on 24 December through Elder on 22 December.

23 December is the remaining intercalary day and receives no tree. The fixed ranges repeat on Gregorian month-days. February 29 stays inside Ash in a leap year, which makes that civil range 29 days and proves the public mapping is not literally a computed lunar month.

What is deliberately not merged

Twenty-one-tree “Celtic zodiac” tables and schemes that assign special trees to equinoxes or solstices belong to later lineages. Combining their dates and traits with Graves's thirteen months would manufacture a consensus none of the versions has.

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.