This interactive tool reconstructs the esoteric calendar described in The Cutting of the Orm by Tracy R. Twyman (2002), which proposes that the Priory of Sion employed a hidden calendrical system encoded within the mystery of Rennes-le-Château.
The calendar divides the year into 13 months of 28 days — 364 days, or exactly 52 weeks — each month governed by one of 13 zodiac houses (including Ophiuchus, the Serpent Bearer), arranged in the order of Le Serpent Rouge.
At its heart is the Compass of Enoch: the 26 letters of the alphabet arranged on a circle, split at M and mirrored (A–M = 1–13, Z–N = 14–26). A 13-pointed star inscribed within this compass generates cipher layers — Atbash, Star Spoke, and Compass Values — that can be chained for multi-pass encoding.
Use the tabs above to explore the zodiac wheel, browse the 13-month calendar grid, convert dates between Gregorian and Priory reckoning (plus Hebrew, Julian, and Mayan calendars), examine the sacred numerology, or encode messages with the cipher tool.
Each month begins on Sunday and contains exactly 4 weeks (28 days). Gregorian dates shown assume Day 1 = January 1 (a working convention—the book does not specify when the Priory year begins).
The Compass of Enoch · XIII Houses of the Zodiac
Note: The book does not specify when the Priory year begins relative to the Gregorian calendar. This converter currently keys Day 1 to January 1 as a working assumption. The 364-day calendar describes an idealized year from a “Golden Age” — the true anchor date, if any, remains one of the mysteries.
All membership numbers, when reduced by 13 and divided by 9, reveal the calendar's structure.
| POS # | # of 364-Day Years | # of Leap Days Added | # of 28-Day Months | Relationships |
|---|---|---|---|---|
| 729 | 2 | 1 (728 + 1 = 729) | 26 | 364 + 243 + 121 + 1 9 × 81 |
| 1093 | 3 | 1 (1092 + 1 = 1093) | 39 | 729 + 364 |
| 2187 | 6 | 3 (2184 + 3 = 2187) | 78 | (1093 × 2) + 1 |
| 6561 | 18 | 9 (6552 + 9 = 6561) | 234 | 3 × 2187 |
| 9841 | 27 | 13 (9828 + 13 = 9841) | 351 | 6561 + 2187 + 729 + 243 + 81 + 27 + 9 + 3 + 1 |
| 29523 | 81 | 39 | 1053 | 9841 × 3 |
| 88569 | 243 | 117 | 3159 | 29523 × 3 |
| 265707 | 729 | 351 | 9477 | 9841 × 27 |
| 797121 | 2187 | 1053 | 28431 | 9841 × 81 |
| 2391363 | 6561 | 3159 | 85293 | 9841 × 243 |
9
Stability in change
The Sun · The Vortex
9 planets · 9 grades
13
Highest feminine unity
The Moon · Luna
13 months · 13 houses
22
9 + 13 = 22
Hebrew letters
Rennes-le-Château
364
13 × 28 = 364
52 weeks exactly
364 / 13 = 28
The alphabet, arranged upon the Compass of Enoch, is split at M and mirrored —
A,B,C,D,E,F,G,H,I,J,K,L,M,Z,Y,X,W,V,U,T,S,R,Q,P,O,N
| Plain |
|---|
| Value |
Letter → compass position number
The Compass of Enoch arranges the 26 letters around a circle, split at M (13) with the second half reversed: A–M = 1–13, then Z–N = 14–26. Three geometric operations on this circle produce three cipher layers, which can be combined for deeper encoding.
The simplest transformation: each letter is replaced by its position number on the compass circle. A = 1, B = 2 … M = 13, Z = 14, Y = 15 … N = 26. Words are separated by dashes, letters within a word by dots. To decode, convert each number back to its letter.
Example: SION → 21.9.25.26
Each letter is substituted with the letter diametrically opposite on the compass — exactly 13 positions away. A↔Z, B↔Y, C↔X … M↔N. Every line connecting an Atbash pair passes through (or very near) the centre of the circle. Because each swap is its own inverse, encoding twice returns the original text — an involution.
Example: SION → HRLM
The 13-pointed star inscribed in the compass connects each letter to a near-opposite letter. Because 13 is odd, no spoke passes through the exact centre — each one misses by half a segment. Letters at odd compass positions shift +11; letters at even positions shift +15. This creates 13 spoke pairs: A↔L, B↔W, C↔Z, D↔U, E↔X, F↔S, G↔V, H↔Q, I↔T, J↔O, K↔R, M↔P, and N↔Y. Like Atbash, the Star Spoke cipher is self-reversing.
Example: SION → FTJY
The three layers can be chained in sequence for progressively deeper encoding. Each mode applies its transforms left to right; decoding reverses the order.
IV · Atbash + Compass: First substitute each letter via Atbash, then convert the result to compass numbers. Decode: numbers → letters → Atbash.
V · Spoke + Compass: First substitute via Star Spoke, then convert to compass numbers. Decode: numbers → letters → Spoke.
VI · Three-Layer: The deepest encoding: Atbash → Star Spoke → Compass numbers. Three passes of transformation make the output far harder to reverse by hand. Decode: numbers → letters → Spoke → Atbash.