Kundli: Free Online Vedic Birth Chart (Janam Kundali)

How the sidereal positions are computed

The sidereal longitude is the astronomy-engine tropical geocentric apparent longitude minus the Lahiri (Chitrapaksha) ayanamsa, wrapped into 0–360°. The Lahiri epoch is 23.8570923537° at J2000. The change with time follows the IAU 2006 general precession polynomial, using centuries of Terrestrial Time. The polynomial is checked against Swiss Ephemeris Lahiri reference values from 1900 to 2100; planetary positions are checked against independent Swiss Ephemeris tropical reference charts. Small differences near a boundary can change a label, and uncertain birth details can have a larger effect.

Astronomy Engine (https://github.com/cosinekitty/astronomy) provides the MIT-licensed astronomical calculations. The Swiss Ephemeris programmer documentation (https://www.astro.com/swisseph/swephprg.htm) describes sidereal modes; Swiss Ephemeris is used as an independent reference, not included in this tool. The IAU SOFA collection (https://www.iausofa.org/) documents the IAU precession model. These sources explain the coordinate calculations.

City names and time zones come from GeoNames (https://www.geonames.org/) under CC BY 4.0. Without a selected city, the Moon tools use the visitor’s time zone. Local date searches include daylight-saving changes; historical time-zone uncertainty can affect a result. Calculations run in the browser and do not upload birth details.

Rashis, houses and navamsa

The twelve rashis are Mesha (Aries), Vrishabha (Taurus), Mithuna (Gemini), Karka (Cancer), Simha (Leo), Kanya (Virgo), Tula (Libra), Vrishchika (Scorpio), Dhanu (Sagittarius), Makara (Capricorn), Kumbha (Aquarius) and Meena (Pisces). They are twelve equal 30° arcs of the sidereal zodiac, not the irregular astronomical constellations. Chandra rashi is the rashi containing the Moon.

Traditional lords are Mars, Venus, Mercury, Moon, Sun, Mercury, Venus, Mars, Jupiter, Saturn, Saturn and Jupiter. The element sequence is fire, earth, air and water, repeated three times. The reference table shows these cultural classifications. The public-domain Sanskrit Brihat Jataka describes the classical sign and lord conventions. The Positional Astronomy Centre of the India Meteorological Department (https://mausam.imd.gov.in/imd_latest/contents/positional.php) publishes national almanac information using Indian calendar conventions.

Whole-sign houses start at the beginning of the lagna’s rashi. Rahu is the mean ascending lunar node and Ketu is exactly opposite it; these are points, not planets. Navamsa divides every sign into nine parts and assigns signs in the standard movable, fixed and dual sequence, equivalent to multiplying sidereal longitude by nine and wrapping at 360°.

Nakshatras and the traditional timing table

The 27 nakshatras divide the sidereal ecliptic into equal arcs of 13°20′, beginning with Ashwini at 0° Mesha and ending with Revati at 360°. Each nakshatra has four padas of 3°20′. Boundary points belong to the following nakshatra or pada. Names refer to traditional lunar mansions, not modern constellation boundaries.

The reference table lists names, traditional deities, symbols and Vimshottari lords. The lord sequence is Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn and Mercury, repeated three times. Deities and symbols are longstanding cultural associations; variants exist across traditions. The public-domain Sanskrit Vedanga Jyotisha and Taittiriya Brahmana preserve early lunar-mansion traditions; the modern equal-arc system is the convention used here. The Positional Astronomy Centre of the India Meteorological Department (https://mausam.imd.gov.in/imd_latest/contents/positional.php) publishes the Rashtriya Panchang and traditional calendar information.

Vimshottari period lengths are Ketu 7, Venus 20, Sun 6, Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19 and Mercury 17 years, totalling 120. A year is exactly 365.25 days here. The table includes the full birth cycle; its first start may precede birth. Each antardasha lasts the parent period multiplied by its lord’s years divided by 120. Dates are UTC and intervals include the start but exclude the end. No event predictions are attached.

How to use it

1. Enter a birth date, time and city, or turn off the birth-time option.
2. Calculate the chart and choose North or South Indian style.
3. Read the planet table, open navamsa, inspect dasha dates and save a card.

Privacy & limitations

Your birth date, time, place and results stay in your browser. The share image contains chart labels and never includes your birth details.