Panchangam Reference

Amrita Kalam windows ​

panchangam.amrita-kalam

Nakshatra-specific Ghati offsets produce auspicious sub-windows.

Assurance ​

LevelCurrent statement
Documented and traceableYes — the canonical record includes the process and a worked example.
Regression or reproduction checkedLinked to 1 repository test file(s).
Independently source-supportedPartial support only; read the provenance note and limitations before generalizing.

Computation method ​

Method type: formula

For the Nakshatra active at sunrise and its successor, place a four-Ghati window at that Nakshatra's configured Amrita offset and retain it only when its start lies inside the sunrise-to-next-sunrise Panchangam day.

Process ​

  1. Find the complete UTC span of the sunrise Nakshatra and the immediately following Nakshatra using the selected engine's Moon model.
  2. Look up the Nakshatra-specific Amrita start offset on a 60-Ghati scale.
  3. Scale both the offset and four-Ghati duration by the actual Nakshatra span rather than by clock minutes.
  4. Keep a window only when day_start <= start < next_sunrise.

Formulae ​

Nakshatra-scaled window ​

text
start = N_start + N_duration * offset[n] / 60
end = start + N_duration * 4 / 60
  • N_start: Nakshatra start
  • N_duration: actual Nakshatra duration
  • offset[n]: maintained Amrita Ghati offset for Nakshatra n

Worked example ​

Hyderabad, 2026-06-11, Drik Ganita ​

Inputs

  • Panchangam day: sunrise 05:41:11 IST to next sunrise 05:41:17 IST
  • Sunrise Nakshatra: Revati; successor: Ashvini
  • Offsets come from AMRITA_GHATIS

Calculation

  1. Construct one four-sixtieths window for each of the two full Nakshatra spans.
  2. Filter by each computed start against the Panchangam-day bounds.

Result

  • 05:59:05.5-07:30:45.166667 IST
  • 23:49:07.4-01:17:56.2 IST; both starts fall within the Panchangam day

Method notes ​

  • The registered umbrella claim does not yet provide a criterion-level locator for the complete Amrita offset table.

Contract ​

Owning layer: engine-core
Claim kind: textual-rule
Time basis: Four-sixtieths of actual Nakshatra duration at the table offset.

Inputs ​

  • Nakshatra spans
  • Amrita offset table
  • day bounds

Outputs ​

  • Amrita Kalam windows

References and evidence ​

Evidence classes: textual, published_panchangam
Verification states: partially_verified

Representative values are compared; the table's full locator coverage remains incomplete.

panchangam.mixed_daily_windows ​

Evidence class: textual
Verification state: partially_verified
Locator: B. V. Raman, Chapter III, Nakshatra Tyajyakala table, inspected in the 2020 Chistabo derivative at internal printed p. 7 (physical PDF p. 10), and Chapter V section 7, Durmuhurta, internal printed p. 13 (physical PDF p. 16); regional tables remain regression-pinned
Last reviewed: 2026-09-04
Scope: The auspicious, inauspicious and Choghadiya response objects are mixed containers. Raman supports the four-Ghati Nakshatra Tyajyakala concept and his printed Durmuhurta scheme, but the project's regional weekday tables are not identical to Raman's table and the remaining Brahma Muhurta, Abhijit, Amrita Kalam, Rahu Kalam, Gulika, Yamagandam and Choghadiya components do not yet have criterion-level textual claims. This state records partial evidence, not umbrella verification.

Sources ​

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 ​

Run the linked tests, then the complete offline contract:

bash
python tools/verify_project.py

Public surfaces ​

  • python-library
  • mcp
  • ics
  • website

Limitations ​

  • Offsets follow one maintained table and are clipped to the Panchangam day convention.

Implementation ​

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