Ring axioms: ārūḍha computation = count-to-lord modulo 12 = residue arithmetic on (ℤ/12ℤ). The 1st/7th exception rule preserves involution on the residue class.
द्वादशारूढम्
Dvādaśārūḍham
Ārūḍha-dvādaśam · the 12 padas + Upapada-Lagna
Reference instant — Maa Kāmākhyā meridian, 1990-01-01 06:00 IST. Compute your own at /chart. In this chart, 4 padas required the 10-house exception (Jaimini-Sūtra 1.1.18).
For each house i with rāśi R and lord rāśi L:
- n = inclusive count from R → L (1..12)
- A_i = (L + n − 1) mod 12 — count n houses forward from L
- If A_i lands on R or on the 7th from R, take the 10th from A_i (= shift by 9) — the Jaimini-Sūtra 1.1.18 exception preventing self-coincidence
- UL = A12, the ārūḍha of the 12th, by Jaimini-Sūtra 1.1.20
The map is a finite-cyclic operation on (ℤ/12ℤ) — a Tier-S algebraic determination, derivation tag (i) ring axioms. No prediction is emitted; the padas are *worldly reflections* (śāstric interpretive layer, Tier-W) and the page surfaces only their structural placement.
Cast your birth chart at /chart. The full 12 + UL grid is included in the chart response.