What Is a Birth Chart? A Guide to the Janam Kundli

A birth chart is a map of the sky drawn for one moment and one place: the time and location of your birth. In India it is usually called a Janam Kundli or Jathagam, and for many families it is the starting point for every astrological question.

The three things a chart needs

To draw a chart accurately, an astrologer needs your date, time and place of birth. The date fixes the slow-moving planets. The place gives the latitude, longitude and time zone. The time is the most sensitive ingredient: the rising sign changes roughly every two hours, and the house positions shift every few minutes. If your birth time is uncertain, say so — a careful astrologer will tell you which parts of the chart may be affected.

Lagna, Rashi and Nakshatra

Three placements come up in almost every Vedic reading:

• Lagna (ascendant) — the zodiac sign rising on the eastern horizon at your birth. It defines the first house and sets the order of all twelve houses.
• Rashi (Moon sign) — the sign the Moon occupied. Vedic astrology gives the Moon sign great importance, and many Indian horoscopes are written by Rashi rather than by Sun sign.
• Nakshatra (birth star) — one of 27 lunar mansions, each spanning 13° 20′ of the zodiac. Your Nakshatra is the one the Moon occupied, and it is traditionally used for naming ceremonies and for calculating Dasha periods.

The nine grahas

Vedic astrology works with nine grahas: the Sun (Surya), Moon (Chandra), Mars (Mangal), Mercury (Budha), Jupiter (Guru), Venus (Shukra), Saturn (Shani), and the two lunar nodes, Rahu and Ketu. Rahu and Ketu are not physical bodies but the points where the Moon’s path crosses the Sun’s apparent path — the points that make eclipses possible.

The twelve houses

The chart is divided into twelve houses (bhavas), each associated with areas of life — the first with the self and body, the seventh with partnership, the tenth with career and public life, and so on. A planet’s meaning in a reading depends on its sign, its house and its relationships with other planets.

North and South Indian charts

You may see a chart drawn as a diamond or as a square grid. In the North Indian style the houses stay fixed and the sign numbers move. In the South Indian style, common in Tamil Nadu, Kerala and Karnataka, the signs stay fixed and the Lagna is marked within the grid. Both show the same information.

Dasha periods

Vedic astrology also uses time-period systems called Dashas. The most widely used, Vimshottari Dasha, divides a 120-year cycle among the nine grahas, beginning from the lord of your birth Nakshatra. Astrologers use the Dasha sequence to discuss which themes may be emphasised in different phases of life.

A note on accuracy and expectations

A chart is only as reliable as the calculation behind it, which is why AstroGuruPlus will not offer personal charts until they run on a verified calculation engine. And a chart describes symbolic themes, not fixed outcomes. It can be a meaningful tool for reflection, but it should never replace professional advice on health, money, law or relationships. See our astrology disclaimer for more.

This article is for general education and cultural interest. It is not a personal reading or professional advice.