How we calculate your kundli
The method behind every AT Astro report, in plain terms, so you can check it against any other source.
1. Your birth details
We use your date, time and place of birth. The place is converted to latitude and longitude, and the time to the correct time zone (India Standard Time for births in India). A wrong place or time changes the chart, so check them before you order.
2. Planet positions
Positions of the Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn and the lunar nodes (Rahu and Ketu) come from the NASA JPL planetary ephemeris. We cross-check charts against the Swiss Ephemeris, a standard reference used by astrology software.
3. Zodiac and houses
- Zodiac: sidereal, with the Lahiri ayanamsa, the standard in India.
- Houses: whole-sign houses counted from the ascendant (Lagna).
- Charts: North Indian style, the Lagna chart (D1) and the Navamsha (D9). The Career report also uses the D10 chart.
4. Panchang
Tithi, nakshatra, yoga and karana are calculated for your birth moment. The weekday (vaar) follows the Vedic day, which begins at sunrise, not midnight, so someone born in the early hours before sunrise has the previous day's vaar. Sunrise is calculated for your birthplace.
5. Dasha periods
We use the Vimshottari dasha system: a 120-year cycle that starts from the Moon's nakshatra at birth. Every mahadasha and antardasha in your report has a start date, an end date and your age. See our guide to Vimshottari dasha.
6. Transits, Sade Sati and yogas
Sade Sati, Dhaiya and the yearly transits are counted from your Moon sign using real planetary positions on each date. Yogas and doshas (such as Manglik) are tested against classical rules, and the classical cancellations are applied.
7. If your birth time is unknown
We prepare a Moon-chart (Chandra kundli) report, which uses the Moon sign as the first house, and the report says which parts are less certain. See our guide.
8. How the text is written
The interpretation comes from a library of classical Vedic rules and explanations written for AT Astro. Which passages appear in your report is decided by the actual placements in your chart. It is not a free-form chat answer, so the same chart always gives the same report.
9. Limits
Astrology is a traditional belief system. The astronomy in the report is exact for the details you give; the interpretation is guidance, not a guarantee. We do not sell gemstones or pujas.
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By AT Labs (AT Astro), GSTIN 29DWCPA2194C1ZU · Updated 24 October 2026