॥ श्री गणेशाय नमः ॥
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No black boxes. This page documents the astronomy engine, its validation, and the classical tables behind every score.
From a birth moment to a finished North Indian chart — the six steps this engine takes, animated.
Note: Vimshottari Dasha periods are derived from the Moon's nakshatra after the chart is fixed — they are computed after this pipeline.
Birth-chart positions are computed by a dependency-free engine that implements published analytical algorithms: Paul Schlyter's planetary theory (standard orbital elements) for the Sun, Moon and planets, and Jean Meeus's algorithms for sidereal time. Positions are converted to the sidereal (Vedic) zodiac with the Lahiri ayanamsa.
The Moon's nakshatra and pada, the rashi, and the lagna (ascendant) are derived from these positions. Birth-place coordinates feed the ascendant and house calculations, and the UTC offset converts local birth time to universal time.
The engine was validated against NASA JPL ephemerides (DE421/DE441) across 41 test dates from 1950 to 2030. Maximum absolute errors found:
| Body | Maximum error |
|---|---|
| Sun | 0.39′ |
| Moon | 2.88′ |
| Mercury | 0.79′ |
| Venus | 0.68′ |
| Mars | 1.94′ |
| Jupiter | 0.87′ |
| Saturn | 1.55′ |
| Lagna (ascendant) | 0.002′ |
| Rahu (lunar node) | 0.11′ |
| Sidereal time (GMST) | 0.003′ |
Guna Milan follows the classical Ashtakoota system: eight kootas worth 36 points in total. The scoring tables are frozen — they do not change between releases, and every result page can be re-checked against them:
Directional kootas (Varna, Vashya) are read with Person 1 in the traditional bride's position and Person 2 in the groom's, as the classical texts prescribe.
Separately from the 36-point score, the calculator checks Manglik dosha for each person: if Mars stands in houses 1, 2, 4, 7, 8 or 12 counted from the rising sign (Lagna), the Moon, or Venus, the chart is flagged Manglik. The classical texts then list cancellations — conditions under which the dosha is treated as nullified — and the calculator applies them automatically:
Depending on how many of the three reference points flag Mars, a chart is graded Anshik (partial), Madhya (medium) or Purna (full) Manglik. A one-sided dosha is traditionally the point most families discuss with an astrologer.
Every interpretation on this site traces to a classical text or a named tradition. Where we synthesize, simplify, or follow a modern compilation, we say so — plainly.
This example is specific to kundli matching (not the single-person kundli above). The frozen regression case, animated: Aarav — 14 Feb 1990, 10:30 AM, Mumbai — and Diya — 22 Aug 1992, 6:15 PM, Delhi. Watch how two birth charts are compared for marriage compatibility.
Every calculation runs in your browser. Birth details are never uploaded, stored on a server, or sent anywhere — the share link carries the inputs inside the URL itself, and saved matches live only in your browser's local storage.
Every tool below runs the same engine you just watched — all free, all computed privately in your browser.