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How to Verify a Vedic Chart Calculation

Build a repeatable Vedic chart verification record. Compare like-for-like coordinates, check boundaries and distinguish calculation agreement from prediction.

Names and related terms
verify Vedic chart · check kundli accuracy · Vedic chart calculation verification

Editorially reviewed: · Reviewed by OpenFate · Editorial Methodology

Overview

Verify a Vedic chart by reproducing its inputs and conventions, then comparing numeric outputs against an independent calculation. Check the birth record, time conversion, longitude table and derived labels separately. This verifies a calculation path, not a life prediction.

At a glance

Input receipt
Original record, resolved instant and location
Method receipt
Version, zodiac, ayanamsa, nodes and houses
Comparison unit
Same factor, frame, instant and precision
Separate test
Predictive validity is not coordinate agreement

Freeze the calculation being tested

Keep the original local record and the converted instant together. Record geographic coordinates, calendar assumptions, software version and relevant options. Without that receipt, a later rerun can silently test a different chart.

Use a second implementation or documented ephemeris with matching conventions. Two websites using the same underlying engine can agree without being fully independent; note that dependency rather than overstating the strength of the check.

Compare numbers before labels

In an original boundary exercise, one output shows 39.999° and another 40.001°. Their separation is 0.002°, or 7.2 arcseconds. They can fall on opposite sides of the 40° Krittika–Rohini boundary even though both rounded to a whole degree display 40°.

Define an appropriate numeric tolerance for the settings and data quality, and retain the raw values. Passing a rounded sign-name comparison is weaker than matching the actual position. Check sign, house and sector derivation separately from the longitude calculation.

Write down what passed and what remains uncertain

A useful result says which timestamps, coordinates and derived fields matched, which tolerance was used, and which differences remain. If the birth time is uncertain, test the interval and identify unstable outputs instead of certifying one guessed instant.

A successful numeric check does not validate a personality reading, relationship verdict or event forecast. Keep those claims out of the calculation pass report. This distinction also makes a later software regression easier to identify without rewriting the person’s life story.

Sources and editorial basis

  1. P. V. R. Narasimha Rao: Vedic Astrology — An Integrated Approach
    Rao §1.3.2 / Table 1, printed p. 6: sign intervals; §1.3.6 / Table 2, pp. 10–11: Krittika–Rohini boundary at 40°. The tolerance exercise and verification worksheet are original editorial methods.A named practitioner’s introduction to Jyotish. Used for terminology and a stated method, not universal school agreement or scientific validation. The added March 18, 2010 note describes changed views; it does not establish a fully revised 2010 edition.
  2. OpenFate Editorial Methodology
    OpenFate Editorial Methodology, stable sections #editorial-principles, #editorial-workflow, #editorial-ai, and #editorial-context. Used for the calculation/interpretation and evidence-boundary policy.OpenFate separates deterministic chart calculation, traditional interpretation, and modern editorial explanation.
  3. Swiss Ephemeris Programmer’s Manual: Time, Sidereal Modes and Houses
    Swiss Ephemeris Programmer’s Manual §§12.1–12.2: sidereal modes, Lahiri variants and consistent position flags; §§3.4 and 15: position fields and angles. Original rounded examples are teaching arithmetic, not actual ephemeris outputs.Primary software documentation for numerical time and position calculations. Sidereal modes, including named Lahiri variants, are explicit settings. The manual does not validate astrological interpretations.
  4. IANA Time Zone Database
    IANA tz database theory.html, “Scope of the tz database” and “Accuracy of the tz database”; historical limitations, especially before 1970. This source does not verify an individual birth record.The maintained source for current and historical civil-time offsets and daylight-saving transitions; it provides timekeeping facts, not astrological interpretation.
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