How to compare two astrology websites
Differences often come from conventions rather than simple bugs.
- Check ayanamsha, coordinates, timezone/DST, ephemeris, sunrise convention and house system.
- Compare exact instants before comparing rounded display values.
- Regional festival, Muhurta and matching rules can legitimately differ even when planetary math agrees.
When two astrology websites disagree, the quickest assumption is often that one is wrong. Sometimes that is true, but many differences come from explicit methodology choices. A useful comparison begins by identifying which quantities should match and which can legitimately vary by convention.
The most reliable process is to work from raw inputs and astronomical intermediates toward interpretation. Compare the exact instant, coordinates and planetary longitudes before comparing houses, Vargas, festival labels or predictions.
Start with the same instant
Confirm the birth or event date, local clock time, timezone and daylight-saving occurrence. A place name alone is not enough if the sites resolve it to different coordinates or historical timezone rules. For an ambiguous DST fall-back time, two valid UTC instants can share the same local clock reading.
If the universal instant differs, later results are not directly comparable. Fix that first before investigating astrology formulas.
Compare zodiac and house conventions
Check tropical versus sidereal zodiac and the exact ayanamsha. Lahiri, Krishnamurti and other ayanamshas produce different sidereal longitudes. Then check the house system: Whole Sign, Placidus and other cusp systems can assign the same planet to different houses.
For a Varga mismatch, compare the D1 longitude first. If D1 agrees but D9 differs, inspect the divisional mapping and boundary rule rather than blaming the ephemeris.
Calendar and regional rules need separate checks
Panchang and festivals can differ because of sunrise anchoring, local coordinates, lunar-day transition thresholds and regional observance rules. Muhurta and marriage matching contain even more school-specific tables and exceptions.
A trustworthy site should disclose the selected rule rather than hiding a disagreement behind a single 'correct' label. Where the site has not validated a regional exception, it is better to mark the limitation than to guess.
Worked example: same planets, different marriage or festival result
Two sites may agree on the Moon longitude and Nakshatra but disagree on a festival date because one rule requires the Tithi at sunrise while another uses a different observance condition. Likewise, two matching pages may agree on birth stars but use different Rajju exception tables.
The correct debugging path is to compare the shared astronomical inputs first, then identify the rule-family difference. A final label alone does not show which layer caused the mismatch.
This lesson is also available as the dedicated Compare Astrology Websites trust page with a printable checklist and links to AstroVedic360 methodology disclosures.
Read the full AstroVedic360 methodology →