01 · TIME
COLIGNY
An ancient Gaulish calendar reconstructed to place your month, five-year cycle and lunar rhythms.
ORACLASTRA
TOUTATIS
YOUR CELTIC SKY
ONE DATE · THREE READINGS · ONE JOURNEY
Explore your birth date through the Coligny calendar, the modern 21 trees, and the world of Robert Graves and ogham.
Reveal my three readingsColigny time
The 21 trees
Graves & ogham
ONE DATE · THREE PERSPECTIVES · FREE
Three ways to read your birth date
Enter your date once. TOUTATIS opens three distinct readings, each with its own context and limits.
✧ Free · No sign-up · Calculated locally, with no API
THREE ERAS · THREE PERSPECTIVES · ONE DATE
A journey in three readings
The same date takes on different meanings in different systems. Explore each one without confusing their origins.
02 · SYMBOL
THE 21 TREES
A tree horoscope from a modern esoteric tradition, separate from the ancient calendar.
03 · STORY
GRAVES & OGHAM
A 20th-century poetic cycle shaped by Robert Graves. Historical ogham remains a separate writing system.
FIRST READING · COLIGNY
The rhythms of Coligny
Month, position, Moon and cycle form the first chapter of your journey.
Your Celtic month
The reconstructed month containing your birth date, and the meaning we give it.
Your rhythm
Your position within the month and the movement it may suggest.
Your Moon
The Moon's phase and illumination on your birth date.
Your five-year cycle
Your place within a five-year cycle and its movement.
I — COLIGNY TIME
The Coligny calendar
Fragments found in France reveal an ancient Gaulish way of arranging months and longer cycles. TOUTATIS uses a modern reconstruction to place your date within that structure.
The personal reading is a contemporary ORACLASTRA creation. It is not presented as an attested ancient Gaulish horoscope.
Explore the methodI — Your place in Coligny time
ORACLASTRA · TOUTATIS
CELTIC MONTH
MOON
FIVE-YEAR CYCLE
POSITION
ORACLASTRA · TOUTATIS
II — THE 21 TREES
Your date has travelled through Coligny time. A modern tree horoscope now offers another way to see it.
III — GRAVES & OGHAM
A modern tradition has paired your date with a tree. The third reading turns to Robert Graves’s literary cycle and ogham names, without presenting them as an ancient calendar.
Your journey can continue
Three perspectives, three eras, one date. Compare an ancient Gaulish calendar, a modern tree horoscope and a 20th-century literary cycle. TOUTATIS is free.
Why three readings?
TOUTATIS places these systems side by side and names their origins. Coligny is an ancient calendar approached through modern reconstruction. The 21 trees form a modern esoteric horoscope. Graves’s cycle is a 20th-century literary creation. Historical ogham is a writing system; the ORACLASTRA stories are contemporary.
What is the Celtic Coligny calendar?
The Coligny calendar is an ancient Gaulish calendar known from fragments found in France. It arranges time into months and longer cycles, adding extra months to keep lunar and seasonal rhythms in step.
Is this a Celtic birth sign?
Instead of assigning a single sign to a stretch of the year, TOUTATIS combines your reconstructed Celtic month, your day within it, your year in the cycle and the Moon. The result offers several points of reference.
Why include the Moon?
The Coligny calendar is closely linked to lunar rhythms. TOUTATIS calculates the Moon's phase for your date locally, without sending it to an external API.
Our research model and its limits
Research model V3.6: The internal cycle follows a modern reconstruction of Coligny based on Helen T. McKay (2016): 1,831 days across 62 months, a 29-day first intercalary month, and EQUOS lengths of 30/28/30/29/30 days. The Moon's phase uses approximate local calculations of solar and lunar ecliptic longitudes. This is less precise than a high-accuracy ephemeris. The modern anchor is 26 April 2015 at first quarter. Projecting the model back to 1936 is a modern reconstruction, not a certain ancient dating.
✓ Calculated entirely in your browser
✓ No account, payment or API
✓ 12 ordinary months plus cycle intercalations
✓ The same date gives the same result
Explore the history behind your readings
The Coligny calendar, modern tree horoscope and Graves-inspired interpretation have different origins. Read our research-led guides.