Anandadi Yoga

derived.anandadi-yoga

A weekday and Nakshatra table assigns one of the 28 Anandadi Yogas.

Assurance

Level	Current statement
Documented and traceable	Yes — the canonical record includes the process and a worked example.
Regression or reproduction checked	Linked to 1 repository test file(s).
Independently source-supported	Not recorded as independently verified. The disclosed provenance state remains authoritative.

Computation method

Method type: formula

Rotate the 28-name Anandadi sequence by the weekday's configured Nakshatra offset, then index it with the active Nakshatra.

Process

1. Look up the zero-based weekday offset in VAARA_OFFSET.
2. Look up the active Nakshatra's zero-based index in NAKSHATRA_ORDER.
3. Subtract the weekday offset, reduce modulo 28, and index ANANDADI_YOGAS.
4. Return null for an unrecognized weekday or Nakshatra.

Formulae

Anandadi index

y = (n - o_v) mod 28

• n: zero-based Nakshatra index
• o_v: weekday-specific starting offset
• y: index in the 28-name Anandadi sequence

Worked example

Guruvaram with Anuradha

Inputs

• Guruvaram offset: 16
• Anuradha Nakshatra index: 16

Calculation

1. (16 - 16) mod 28 = 0.
2. ANANDADI_YOGAS[0] is Ananda.

Result

• Ananda

Method notes

• The rotation and dispositions are regression-pinned; the exact source-edition locator remains open and is disclosed in Provenance.

Contract

Owning layer: derived
Claim kind: textual-rule
Time basis: Panchangam day and its active Nakshatra.

Inputs

• Vaaram
• Nakshatra

Outputs

• Anandadi Yoga name

References and evidence

Evidence classes: textual
Verification states: needs_locator

The table is regression-tested but still belongs to the broader derived-classification locator gap.

panchangam.derived_classifications

Evidence class: textual
Verification state: needs_locator
Locator: No precise locator is registered.

Scope: Special Yogas, Panchaka labels, Khara month, Pitru Paksha, Simha-Stha, Maudhya, Anandadi Yoga, Disha Shoola, Nakshatra Mukha and Panchaka Rahita are separate traditional classifications. The group exists to expose evidence debt and grants no umbrella textual authority; each component needs its own inspected rule table and regional boundary.

Sources

• Muhurtha (Electional Astrology) — B. V. Raman; UBS Publishers' Distributors, 1993, ISBN 9788185674681, 181 catalogued pages; authority type: modern_synthesis
• Muhurta Chintamani — Rama Daivajna; Undated Sanskrit text with Hindi commentary, Internet Archive identifier muhurta-chintamani-hindi; authority type: primary_text_hindi_commentary

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_anandadi.py

Run the linked tests, then the complete offline contract:

python tools/verify_project.py

Public surfaces

• python-library
• mcp
• ics
• website

Limitations

• The table is a named textual convention, not an astronomical observation.

Implementation

• owner: telugu_panchangam/special_yogas.py — compute_anandadi_yoga

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