Planetary Hora windows

personal.hora

Chaldean order and weekday lord assign twelve day and twelve night planetary hours.

Assurance

Level	Current statement
Documented and traceable	Yes — the canonical record includes the process and a worked example.
Regression or reproduction checked	Linked to 2 repository test file(s).
Independently source-supported	Not recorded as independently verified. The disclosed provenance state remains authoritative.

Computation method

Method type: formula

Divide daylight and night into twelve equal parts and assign lords by the repeating seven-Graha Chaldean sequence starting from the weekday lord.

Process

1. Compute next sunrise for the observer.
2. Divide sunrise-to-sunset by 12 and sunset-to-next-sunrise by 12.
3. Select the weekday lord's index in Sun, Venus, Mercury, Moon, Saturn, Jupiter, Mars order.
4. Emit twelve day and twelve night windows, advancing one lord per window without resetting at sunset.

Formulae

Hora boundaries and lord

day_i=[rise+(i-1)D/12,rise+iD/12]; lord_i=L[(start+i-1) mod 7]

• D: daylight duration
• L: seven-lord sequence
• i: one-based Hora index

Worked example

Hyderabad, Guruvaram 2026-06-11

Inputs

• Sunrise: 05:41:11 IST
• Sunset: 18:50:12 IST
• Weekday lord: Jupiter

Calculation

1. Day Hora length is approximately 1h05m45s.
2. Start the lord cycle at Jupiter, followed by Mars.

Result

• Jupiter Hora: 05:41:11-06:46:56 IST
• Mars Hora: 06:46:56-07:52:41 IST

Method notes

• The astronomical segmentation and sequence are deterministic; browser favourability badges do not constitute a personal Hora election.

Contract

Owning layer: personal
Claim kind: textual-rule
Time basis: Twelve equal day parts and twelve equal night parts.

Inputs

• Vaaram
• sunrise
• sunset
• next sunrise

Outputs

• 24 planetary Hora windows

References and evidence

Evidence classes: textual
Verification states: needs_locator

Order and segmentation are parity-tested, but a claim-level source locator is not yet registered.

No registered claim ID; the provenance note below is the current disclosure.

The complete machine-readable source registry is available in provenance.json. A regression fixture or same-code reproduction is not independent verification.

Reproduce and review

• tests/test_lagna_hora.py
• tests/test_browser_smoke.py

Run the linked tests, then the complete offline contract:

python tools/verify_project.py

Public surfaces

• python-library
• mcp
• website

Limitations

• Planetary favourability labels in the browser are presentation, not personalized Hora judgment.

Implementation

• owner: telugu_panchangam/personal/lagna_hora.py — get_horas
• mirror: src/panels/today.ts — computeHoras

This route is generated from computations.json. Edit the registry and canonical reference prose in the same pull request as a behavior change.