Celtic tree calendar
Glossary · Last updated: 2026-07-26
The Celtic tree calendar popularized by Robert Graves divides the year into thirteen periods, each associated with a tree (Birch, Rowan, Ash, etc.).
Scholars debate how much is ancient vs twentieth-century synthesis. Our app uses the common date table for accessible cultural exploration.
Thirteen moons
Some versions tie trees to lunar months rather than fixed Gregorian slices. We document the fixed-date mapping used in our calculator.
Related
Main reading and tools
These are the main reading and calculator pages. Use them for a daily note, a birth-sign tool, or a pair check.
- Today's Horoscope hubAll twelve Western sun-sign daily pages, plus links into the seven-tradition reader.
- Horoscope & Zodiac CompatibilityTwo birth dates for Western, Chinese, and Vedic folk pairing, plus every sun-sign hub.
- Zodiac Sign CalculatorWestern sun sign from birth date, with element, modality, and ruler.
- Vedic Rising Sign CalculatorLagna estimate when you have birth date, time, and place.
- Vedic Moon Sign CalculatorJanma Rashi and nakshatra when birth time and city are available.