How Acharya Jyotish Calculates Your Kundli (and Why It's Accurate)
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Two Kundli generators can take the same birth details and disagree — sometimes enough to place a planet in a different Nakshatra, which changes the reading. The difference is almost always the astronomy underneath. Here is exactly how Acharya Jyotish builds a chart, and why you can trust the numbers.
The models we use
Planetary longitudes are computed from VSOP87 for the Sun and the planets, and ELP-2000/82 for the Moon. These are the same astronomical theories that sit behind Swiss Ephemeris, the reference most professional software relies on. Nutation uses the IAU 1980 series.
From tropical to sidereal
Raw positions are tropical; Vedic astrology is sidereal. We apply the Lahiri (Chitrapaksha) Ayanamsa by default, calibrated to match Swiss Ephemeris at the J2000 epoch. If your tradition uses a different correction, you can switch to Raman, Krishnamurti or Yukteshwar Ayanamsa.
How we prove it
Every release runs a parity suite against Swiss Ephemeris and Jagannatha Hora. The tolerances we hold:
- Planets: within 0.05° (3 arcminutes)
- Moon: within 0.1° — the figure that protects correct Nakshatra padas
- Ascendant: within 0.02°
- Shadbala: within ±0.03 Rupa of Jagannatha Hora
Why it matters
A chart is a chain of derived values: positions feed the Nakshatras, which feed the Vimshottari Dasha; positions feed the divisional charts, which feed the yogas and doshas. An error at the top quietly propagates all the way down. Getting the astronomy right is the unglamorous foundation that makes everything above it trustworthy.
Want to see it on your own chart? Generate a free Kundli or read what a Kundli actually is first.