Panchang Calculation Methodology
Astrooz provides highly accurate Vedic calculations by strictly adhering to exact geographic coordinates and traditional astronomical ephemeris standards. Below is a detailed breakdown of the methodologies and constants used in our Panchang engine.
1. Astronomical Engine & Ephemeris
Our calculation engine relies on Swiss Ephemeris (Swisseph) data models, which provide state-of-the-art precision for planetary and lunar positions. This ensures that the angular distance between the Sun and Moon (the basis of Tithi, Yoga, and Karana) is calculated with microsecond accuracy.
2. Ayanamsa System
We exclusively use the Lahiri Ayanamsa (Chitra Paksha). This is the official Ayanamsa adopted by the Government of India's Calendar Reform Committee. It corrects the drift of the equinoxes, ensuring that our sidereal (Nirayana) zodiac coordinates align perfectly with traditional Vedic requirements.
3. Local Sunrise and Sunset
Vedic days do not begin at midnight; they begin at the exact moment of local sunrise. Our engine uses geometric center calculation adjusted for atmospheric refraction to determine the precise moment the upper limb of the sun breaks the horizon for your specific latitude and longitude.
This is why a Panchang generated for Mumbai will differ from one generated for Kolkata, even on the same calendar day.
4. Auspicious Timings (Muhurats)
Abhijit Muhurat: Calculated as the 8th Muhurat of the day out of 15 equal diurnal divisions. It centers exactly on local solar noon, meaning it shifts dynamically depending on your distance from the IST meridian (82.5° E).
Rahu Kaal: Calculated by dividing the daytime (sunrise to sunset) into eight equal segments. The specific segment assigned to Rahu Kaal changes depending on the weekday, in strict accordance with traditional astrological texts.