A Janma Kundali is the chart of the sky as it stood over your birthplace at the moment you were born. It records the twelve houses, the sign rising on the eastern horizon, and the position of the nine grahas by sign and degree. Everything a Vedic astrologer says afterwards is read from that one diagram.
What the chart actually records
Three inputs produce a kundali: the date, the clock time, and the place. The date fixes the Sun and the slower grahas. The place fixes the horizon. The time fixes the lagna — the point of the zodiac rising in the east — and the Moon's degree, which are the two fastest-moving things in the chart.
- Twelve bhavas (houses), each governing a defined area of life, counted from the lagna.
- Nine grahas — Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn, Rahu and Ketu — placed by sign and degree.
- The nakshatra the Moon occupies, which starts the Vimshottari dasha sequence.
- Divisional charts (vargas), derived arithmetically from the same positions and read for specific questions.
Why the birth time matters to the minute
The lagna moves through one full sign in roughly two hours, so it changes sign about twelve times a day. A twenty-minute error can leave the lagna in the same sign but shift every house cusp; a two-hour error can change the lagna sign outright and reassign all twelve houses. Because the divisional charts are computed from the same degrees, an error in the lagna propagates into every one of them.
This is why an astrologer asks for a recorded time rather than a remembered one, and why a chart built on “sometime in the morning” is treated as provisional. Where the time is genuinely unknown, the standard approach is birth-time rectification — narrowing the time by testing candidate lagnas against events that have already happened — not guessing.
What to bring to a reading
Bring the date, the time as precisely as it was recorded, and the town or city rather than the district. If a hospital record or a birth certificate carries the time, use that in preference to family recollection. If two sources disagree, say so — an astrologer would rather rectify a known conflict than work from one source and discover the other later.
What is established, and what varies
These are kept apart deliberately. The first list is what published practice describes consistently; the second is where families, regions and sampradayams legitimately differ, and where a Purohit’s own tradition decides the answer rather than a general rule.
Consistently described
- The kundali is built from date, time and place of birth, and the lagna is determined by the time and place together.
- The Moon's nakshatra at birth begins the Vimshottari dasha sequence.
- Vedic astrology uses the sidereal zodiac, which is why a Vedic Sun sign often differs from the Western one for the same birth.
Varies by tradition
- Which ayanamsa (the sidereal offset) is used differs between schools; Lahiri is the common default in Indian practice, and a different choice can move a graha near a sign boundary.
- North Indian, South Indian and Bengali chart diagrams show the same data in different layouts; the layout is presentation, not a difference in reading.
- How much weight a reader gives to divisional charts against the rasi chart is a matter of school and training.
Related service
If this applies to you, Birth Chart / Janma Kundali is the service that addresses it. It sits under Astrology — Personal Astrology.
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