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कोट-चक्रम् · BPHS CH. 28 · 4 RINGS × 28 NAKṢATRAS

कोट-चक्रम् — the fortress wheel

Four concentric rings — stambha, madhya, prākāra, bāhya — assigned from the janma-nakṣatra by fixed offset arithmetic. Transits are read against the fortress structure: which ring a graha occupies is a computable fact of the wheel.

Ring arithmetic only. The wheel classifies positions; it does not predict sieges, and nothing here is a remedy.

Janma-nakṣatra

अश्विनी Aśvinī

index 0

Rings

4

stambha · madhya · prākāra · bāhya

Nakṣatras

28

incl. Abhijit · offsets reckoned from janma

Transit overlay

—

?transit=0..26

01

The four rings

STAMBHA → BĀHYA · INSIDE OUT

स्तम्भ Stambha

Centre (king's seat) · 4 nakṣatras
  • रोहिणीRohiṇī+3 from janma
  • पूर्वफल्गुनीPūrvaphālgunī+10 from janma
  • ज्येष्ठाJyeṣṭhā+17 from janma
  • शतभिषाŚatabhiṣā+24 from janma

मध्य Madhya

Inner-middle (Durgāntara) · 8 nakṣatras
  • कृत्तिकाKṛttikā+2 from janma
  • मृगशीर्षMṛgaśīrṣa+4 from janma
  • मघाMaghā+9 from janma
  • उत्तरफल्गुनीUttaraphālgunī+11 from janma
  • अनुराधाAnurādhā+16 from janma
  • मूलMūla+18 from janma
  • धनिष्ठाDhaniṣṭhā+23 from janma
  • पूर्वभाद्रपदाPūrvabhādrapadā+25 from janma

प्राकार Prākāra

Boundary wall · 8 nakṣatras
  • भरणीBharaṇī+1 from janma
  • आर्द्राĀrdrā+5 from janma
  • आश्लेषाĀśleṣā+8 from janma
  • हस्तHasta+12 from janma
  • विशाखाViśākhā+15 from janma
  • पूर्वाषाढाPūrvāṣāḍhā+19 from janma
  • श्रवणŚravaṇa+22 from janma
  • उत्तरभाद्रपदाUttarabhādrapadā+26 from janma

बाह्य Bāhya

Exterior of the fort · 8 nakṣatras
  • अश्विनीAśvinī+0 from janma
  • पुनर्वसुPunarvasu+6 from janma
  • पुष्यPuṣya+7 from janma
  • चित्राCitrā+13 from janma
  • स्वातीSvātī+14 from janma
  • उत्तराषाढाUttarāṣāḍhā+20 from janma
  • अभिजित्Abhijit+21 from janma
  • रेवतीRevatī+27 from janma
02

Compute

URL PARAMETERS · N = 0..26

Append ?janma=N and ?transit=N to the URL — both are nakṣatra indices 0..26, demo values only. Example: /kota?janma=3&transit=9 (Rohiṇī janma · Maghā transit).

03

Provenance

SOURCES · IMPLEMENTATION

  • Algorithm: lib/chakra-kota.ts — deterministic ring assignment, ~170 LOC.
  • Sources: BPHS Ch. 28 · Phaladīpikā 18.16–30 · Praśna-Mārga 17.95–100.

The wheel is offset arithmetic on the 28 nakṣatras (Abhijit included between Uttarāṣāḍha and Śravaṇa) — fully reproducible from the published kota-cakra construction.