Navamsa D9 Chart Calculator
The chart an astrologer checks second, and almost no free tool computes.
The Navamsa, or D9 divisional chart, is used in Vedic astrology to examine planetary strength and relationship themes. It divides each sign into nine parts to produce a second chart, read alongside the birth chart rather than instead of it.
What the Navamsa is
The Navamsa — D9 — is a chart derived from your birth chart by dividing each sign into nine parts of 3 degrees 20 minutes. Each part maps to a sign, and plotting every planet by the part it occupies produces a new twelve-sign chart. Navamsa means ninth part.
It is the divisional chart Vedic astrology consults most. Tradition reads it for marriage, and more broadly as showing the inner substance of a planet as against its outward appearance in the birth chart — a planet strong in the D1 but weak in the D9 is read as promising more than it delivers.
Your D9 ascendant is usually a different sign from your birth ascendant, and that is expected rather than an error: it is whichever navamsa segment your exact rising degree falls in. A planet in the same sign in both charts is vargottama, read as notably strengthened.
Calculate your Navamsa (D9) chart
Each sign divided into nine, producing a second chart read for marriage and for the underlying strength of a placement. Shown beside your main chart so you can compare.
What it is called
Vedic astrology reached the English-speaking world through several routes, so most concepts here carry a Sanskrit name and one or two translations. They are the same thing.
- Navamsaalso called D9 chart, ninth divisional chart
- Each sign divided into nine parts of 3°20′, each mapped to a sign. Read for marriage and for the underlying strength of every planet.
- Vargaalso called divisional chart, harmonic chart
- Any chart made by subdividing the signs of the birth chart. D1 is the birth chart, D9 the navamsa, D10 the dashamsa read for career.
- Vargottamaalso called —
- A planet in the same sign in both D1 and D9. Read as strengthened, because its outward placement and inner substance agree.
- Padaalso called quarter of a nakshatra
- 3°20′ — the same width as a navamsa. This is not a coincidence: the pada a planet occupies is what determines its navamsa sign.
How the ninth division is built
Take a sign — thirty degrees — and cut it into nine equal parts of three degrees twenty minutes each. Every planet in your birth chart falls into one of those parts, and each part is assigned a sign by a fixed rule. Plot the planets by their assigned signs and you have the D9.
The mapping rule depends on the element of the original sign. For a fire sign the nine navamsas run from Aries onward; for an earth sign from Capricorn; for air from Libra; for water from Cancer. So a planet at 5 degrees Leo and a planet at 5 degrees Taurus land in different navamsa signs even though both are five degrees into their sign.
The width — 3°20′ — is exactly a quarter of a nakshatra, which is a pada. That is why the pada matters so much: knowing a planet's nakshatra and pada is knowing its navamsa. The two systems are describing the same subdivision of the circle from different starting points, which is a good example of how internally consistent the Vedic scheme is.
What the D9 is read for
The D9 is not a second opinion on the D1. Tradition treats them as answering different questions about the same chart, and reads them together.
- chevron_rightMarriage and partnership — the primary use, and the reason the chart is usually consulted. The D9 ascendant, its lord, and the condition of Venus and the 7th lord within the D9 are all read.
- chevron_rightThe real strength of a planet — a planet strong in the D1 but weak in the D9 is read as promising more than it delivers; the reverse as delivering more than it appears to. This is the D9's broadest application and it applies to every reading, not only marriage.
- chevron_rightVargottama placements — same sign in D1 and D9, read as a genuinely reinforced position. Arivyah flags these rather than requiring you to compare the charts manually.
- chevron_rightThe second half of life — some schools read the D9 as weighting later life more than the D1 does, on the reasoning that inner substance emerges over time. This is a school-dependent reading rather than a universal one.
- chevron_rightVimshopaka strength — a weighted score across several divisional charts, in which the D9 carries a large share. Arivyah computes it, which is a more complete answer than reading the D9 alone.
Where to go next
Each of these reads a different part of the same birth data, so once one is computed the rest need nothing more from you.
Generate your birth chart and D9 together
The D9 is read alongside the D1, and Arivyah computes twelve divisional charts in all.
Find your nakshatra and pada
A pada is exactly one navamsa wide — the pada is what sets the D9 position.
Score a match with Guna Milan
The kootas leave the Navamsa out, which is why tradition reads the D9 alongside them.
Run a full compatibility reading
Eight kootas, dosha checks and both charts, rather than a single score.
Calculate your birth ascendant first
The D9 ascendant is derived from the exact rising degree, so the D1 lagna comes first.
Check Mangal Dosha
Read alongside the D9 when the question is marriage.
Questions
What is a Navamsa chart?add
A second chart derived from your first one by dividing each sign into nine parts. Navamsa means 'ninth part'. Each of those parts maps to a sign, and plotting every planet by the part it occupies produces a new twelve-sign chart — the D9. It is the divisional chart Vedic astrology consults most, and it is read alongside the birth chart rather than instead of it.
Is the D9 chart the same as the Navamsa?add
Yes. D9 is shorthand for the ninth divisional chart, and Navamsa is the Sanskrit name for the same thing. The divisional charts are all named this way — D1 is the birth chart itself, D10 divides each sign into ten and is read for career, D7 into seven for children. There are sixteen in the classical scheme and Arivyah computes twelve of them.
Why is the Navamsa read for marriage?add
Two reasons are usually given. The ninth harmonic connects the D9 to the ninth house, which signifies dharma — and marriage in this tradition is read as a dharmic commitment rather than only a personal one. The other is practical: the D9 is traditionally treated as showing the inner substance of a planet as against its outward appearance in the D1, and a marriage is where inner substance shows. It is also read for a planet's underlying strength generally, not only for marriage.
Why is my Navamsa ascendant different from my birth ascendant?add
Because it is a different calculation on the same position. The D1 ascendant is the sign rising on the eastern horizon. The D9 ascendant is whichever navamsa segment that exact rising degree falls in, mapped to a sign. A rising degree in Libra can easily land in a Taurus navamsa, and then your D9 ascendant is Taurus. This is normal and expected — the two charts are meant to differ.
What is vargottama?add
A planet occupying the same sign in both the D1 and the D9. It is read as a notably strengthened placement — the outward position and the inner substance agreeing. It happens for a minority of placements in most charts, and Arivyah flags it where it occurs rather than leaving you to compare the two charts by eye.
Do I need an exact birth time for the D9?add
More than for the D1, yes, and this is worth understanding before you rely on it. A navamsa segment is 3 degrees 20 minutes wide, so the ascendant — which moves a degree roughly every four minutes — crosses one about every thirteen minutes. A birth time off by fifteen minutes can give a different D9 ascendant entirely. The faster-moving points are similarly sensitive. With an uncertain time, the D1 is far more trustworthy than the D9.
How this is calculated
The arithmetic, and where it stops
Every planet's sidereal longitude is computed from Swiss Ephemeris data with the Lahiri ayanamsa. The navamsa is then found by taking the position within its sign, dividing by 3°20′ to get one of nine indices, and mapping that index to a sign by the element rule — fire from Aries, earth from Capricorn, air from Libra, water from Cancer. Whole-sign houses are used in both charts.
Twelve divisional charts are computed from the same positions — D1, D2, D3, D4, D7, D9, D10, D12, D16, D20, D24 and D27 — along with a Vimshopaka weighted strength across them, so the D9 can be read in context rather than in isolation.
Birth time precision matters more here than in the D1. A navamsa is 3°20′ wide and the ascendant crosses that in about thirteen minutes, so an uncertain time makes the D9 ascendant unreliable while leaving the D1 largely intact. Where the time is uncertain the chart says so rather than presenting a D9 ascendant with false confidence.
Positions are astronomy and can be checked against any ephemeris. What a position is said to mean is astrological interpretation, and this site presents it as tradition rather than as established fact. How every chart here is calculated.
See your D9 beside your D1
Arivyah computes twelve divisional charts plus a Vimshopaka strength across them, so the Navamsa can be read in context rather than alone.