The Navamsa (D9): the second chart, and why it needs your birth time to the minute

A birth chart answers one question about each graha: which of the twelve signs was it in? The Navamsa asks a finer one: where inside that sign? It cuts every sign into nine parts, gives each part a sign of its own, and so builds a second complete chart from the same planets at the same moment. It is written D9, because it divides each sign by nine, and it is the most widely used of the divisional charts.

This app follows the method its engine takes from Jyotisha-Siddhanta-Sara, Ch. II.

Nine parts, and where the count starts

Each 30-degree sign is split into nine parts of 3 degrees 20 minutes. The engine divides a point's degree within its sign by that width and drops the remainder, giving a part from 1 to 9. Part 1 starts from a sign set by the sign's type, and each later part moves one sign forward.

Take the sample chart the calculator page shows: born 14 August 1994 at 06:42 in Ahmedabad. The ascendant is 2.33 degrees into Leo, the first part of a fixed sign, so the count starts from the 9th sign from Leo, Aries: the D9 ascendant is Aries. The Moon is 24.64 degrees into Libra, the eighth part of a movable sign, and the eighth sign counted from Libra itself is Taurus.

The three rules look arbitrary until the parts are laid end to end. Aries runs from Aries to Sagittarius, and Taurus opens on Capricorn, the next sign. Taurus ends on Virgo, and Gemini opens on Libra. The count never restarts: the zodiac holds 108 parts, the twelve signs nine times over. Checked at 360,000 points around the circle, the engine and that one continuous count agreed at every one.

And 108 is 27 nakshatras times four padas, both counted from 0 degrees Aries, so each navamsa is the same 3 degrees 20 minutes of sky as one pada. The sample Moon is in Vishakha pada 2, which is its Taurus navamsa. The nakshatra article explains padas.

The same rule in Parashara

The engine cites Jyotisha-Siddhanta-Sara for its method, but the rule is not peculiar to that book. Brihat Parashara Hora Shastra states it in Chapter 6, Sloka 12, in one sentence: the Navamsa is counted for a movable sign "from there itself", for a fixed sign from the 9th, and for a dual sign from the 5th. That is the table above, word for word in substance. Two independent classical sources giving the same rule is worth noting, because it is not true of every divisional chart: some of the finer vargas are described differently by different authorities, and the Navamsa is among the least disputed.

Chapter 6 places the Navamsa sixth in a list of sixteen divisions - the Shodasha Varga - that runs from the sign itself to the sixtieth part. Chapter 7 then says what each is for, and this is where the Navamsa's reputation comes from. In one long sentence, Parashara assigns each division a subject. This site has a calculator for every one of them:

So the Navamsa's association with marriage is in the text: "spouse from Navamsa". It is one line in a list of sixteen, not a statement that the D9 is the second most important chart for everything - though the weight Parashara gives it elsewhere, below, explains why later practice treats it that way. The neighbouring divisions can be computed with the Hora (D2), Drekkana (D3), Saptamsa (D7), Dashamsa (D10), Dwadasamsa (D12) and Shashtiamsa (D60) calculators, among others; the 7th house page covers the birth-chart house the texts also read for marriage.

Vargottama: where the two charts agree

A point is vargottama when its D9 sign matches its birth-chart sign. The table's last column shows where: one part per sign, the one where the count comes back to the sign itself. That is one ninth of the zodiac.

In the sample chart it is Saturn, in the fifth part of fixed Aquarius. The count starts from the 9th sign from Aquarius, Libra, and runs Libra, Scorpio, Sagittarius, Capricorn, Aquarius. Saturn is that chart's only vargottama point.

The engine's notes describe vargottama as classically read as a significant strengthening of the placement, and the Kundali page's Navamsa card calls it a placement whose strength holds up under closer scrutiny. No engine scores it: the calculator reports a yes-or-no flag and stops there.

What the texts actually say about vargottama

With the corpus searchable, the classical uses of the word can now be listed rather than summarised. They are fewer and more specific than the word's popular reputation suggests.

• BPHS defines it in passing, in Chapter 36: a graha "occupying the same Rasi and the same Navamsa". The same passage gives one reading - the ascendant's lord in vargottama "will give immunity to diseases" - among a list of readings for the lord in various divisional dignities. That is a classical association, not medical advice.
• BPHS Chapter 46 makes vargottama a condition for a whole dasha system: Shatabdik dasha is "considered appropriate" when the ascendant is vargottama. The alternate dashas calculator prints that condition for Shatabdik, and the engine passes it through without testing it.
• Saravali, in its chapter on the Moon in the navamsas, grades the Moon's results by its navamsa: full in a vargottama navamsa, medium in its own, minor in others - and it adds that this grading is reversed for evil effects.
• Saravali's chapters on royal yogas use it twice more: an ascendant or Moon in a vargottama navamsa aspected by five or six planets is described as raising a person to kingship; and, the other way round, an ascendant in vargottama with no planet aspecting it is said to make the royal yogas "a failure".

The last item is the useful corrective. Even in Saravali, vargottama is not a simple bonus: in one of its two uses there it cancels rather than strengthens. The texts treat it as a condition that changes how other factors are read, which is roughly what the engine's cautious wording says, and is a good reason the engine reports it as a flag rather than adding it to a score.

Why it needs your birth time to the minute

Anything moving through the signs moves through navamsas nine times as often, and the fastest point in a chart is the ascendant. Measured on this engine at five cities, the D9 ascendant changed about 108 times a day and held each sign 13.3 minutes on average: from about 9 to 16 minutes at Indian latitudes, since some signs rise faster than others, and 5.5 to 19 at London's.

In the sample chart, the Leo ascendant holds from about 06:32 to 08:43. The Aries D9 ascendant holds only from about 06:32 to 06:46. A birth time written down five minutes late gives a Taurus D9 ascendant, and every D9 house renumbers with it, because the houses are counted in whole signs from there.

The Moon comes next. It crossed a navamsa boundary every 5.2 to 6.8 hours across 2024 and 2025, so a birth date alone never settles it: the sample Moon holds Taurus only from about 04:29 to 10:09. The slow grahas are the opposite case.

A second chart: a vargottama ascendant, and how long it lasts

The birth on 15 August 1990 at 10:30 IST in New Delhi, used in the Mahadasha essay, has a Virgo ascendant at 28.71 degrees - the ninth part of a dual sign. Virgo's count starts from the 5th sign from it, Capricorn, and the ninth sign from Capricorn is Virgo again. So this ascendant is vargottama: the D1 and D9 ascendants are both Virgo. The Moon at 18.92 degrees of Taurus is in the sixth part of a fixed sign, counted from Capricorn, which is Gemini - the same answer the pada gives, Rohini 3.

Stepping the engine through the half hour around the birth time shows how fragile the ascendant's condition is. The Virgo navamsa of a Virgo ascendant begins at 10:20:40 and ends at 10:36:00, when Libra starts to rise. From 10:36 the ascendant is Libra in the D1 and Libra in the D9 - the first part of a movable sign counts from the sign itself - so it is still vargottama, but in a different sign, with every house renumbered in both charts. Before 10:20:40, it is a Virgo ascendant with a Leo navamsa, and not vargottama at all. A recorded time of "10:30" thus sits six minutes from one change and ten from another.

Notice that the four grahas sharing Cancer in the birth chart - Sun, Jupiter, Venus and Ketu - land in four different D9 signs. That is the Navamsa doing exactly what it is for: separating planets the sign chart lumps together, by where in the sign each one sits.

How much the D9 weighs in the classical strength scheme

BPHS Chapter 7 also gives a number for the Navamsa's importance, in the Vimshopaka strength system, which scores a graha out of 20 by its dignity across a set of divisional charts. The weights depend on which set is used. In the six-division scheme, the Navamsa carries 5 of the 20 points, second only to the sign itself at 6. In the full sixteen-division scheme, the Navamsa carries 3, against 3.5 for the sign and 4 for the Shashtiamsa, with most of the others at half a point. In the ten-division scheme it carries 1.5, the same as eight others.

So in the two schemes where it is weighted individually, the Navamsa is among the heaviest divisions after the sign itself. This app's Vimshopaka Bala calculator uses the sixteen-division weights, D9 at 3 of 20, as described below. The same chapter adds a timing note that applies to every division: effects are full, medium and nil at the beginning, middle and end of a Hora, and "similar applications" are to be made for the Navamsa. The engine does not apply that graduation; it is reported here because the text gives it.

One more passage shows how the translation itself handles the Navamsa's growing role. In the chapter on royal yogas, after the classical relationships between the lords of kendras and trikonas, the translator adds a note extending them to Navamsa positions - Mars in Venus's navamsa and Venus in Mars's - and says plainly that "there is no specific classic sanction for this". It is a useful marker of where the text ends and later practice begins, and this app follows the text: it reads no yoga from a navamsa exchange.

The D9 against the other fifteen divisions

The Navamsa's sensitivity to birth time is not special; it is simply where it sits on a scale. Every division N cuts a sign into N parts, so its ascendant changes N times as often as the sign ascendant. With a rising sign lasting about two hours on average, the average time the divisional ascendant holds one sign is roughly 120 minutes divided by N:

Seen this way, the D9 is the last division whose ascendant a carefully recorded birth time can usually settle. A hospital time to the minute leaves the D9 ascendant settled unless it is within a minute or two of a boundary; the same time leaves the D60 ascendant uncertain far more often. The divisional planets are a different matter: they depend only on longitudes, and for everything slower than the Moon they hold for hours or days, as the table of daily changes above shows.

How the texts use the Navamsa beyond marriage

Search the corpus for the Navamsa and the "spouse" line in Chapter 7 turns out to be a small part of its use. Across BPHS the Navamsa appears more than a hundred times, and mostly in one role: as a second test of a graha's dignity. Again and again a condition is phrased "in its own Rasi or Navamsa", "in exaltation in Rasi or Navamsa", "in a debilitation Navamsa". The Navamsa sign is treated as a second address for the planet, and a planet's condition there is read alongside its condition in the sign.

• In the yogas. BPHS's chapter on royal yogas gives one formed when the birth ascendant, the Drekkana ascendant and the Navamsa ascendant all hold exalted grahas, and a "Maha Raj Yog" in which the relevant karakas are in their own Navamsa among other dignities. What a yoga in your chart means covers how this app detects yogas and which of these conditions it checks.
• In the Karakamsa. BPHS Chapter 33 reads the Navamsa sign of the Atma Karaka - the Karakamsa - sign by sign, and builds a whole chapter of readings from it. Ishta Devata and the Karakamsa covers that use, and its limits, in detail.
• In the early chapters on birth, where several rules name "the Rasi or Navamsa rising" or two luminaries "in one Navamsa" - small, concrete uses that show the Navamsa was a working tool, not only a marriage chart.
• In longevity: BPHS's chapter on longevity counts contributions by Navamsas gained from Aries in one of its methods.

For the 1990 chart, the Karakamsa can be read straight off the table above. The Atma Karaka is the classical graha furthest into its sign; here that is the Sun at 28.40 degrees of Cancer, ahead of Mars at about 27.6 and Saturn at about 26.2 - a margin wide enough that the planet-frame limit described in this file's notes does not change the order. The Sun's Navamsa is Pisces, so the Karakamsa is Pisces.

The Moon in the navamsas, in Saravali

Saravali gives a whole chapter, its 24th, to the Moon's Navamsa. It does not go sign by sign; it goes by the lord of the Navamsa - the Moon in a navamsa of Mars, of Venus, of Mercury, and so on - and then, as it did for the Moon's sign in the chapter before, by which planet aspects it there. Each combination gets a line or two. The structure is the point: the classical reading of the Moon's Navamsa is a reading of its lord and its aspects, not of a sign in isolation. The 1990 Moon, in a Gemini navamsa, is in a navamsa of Mercury, and Saravali's entry for it would be chosen by that lord and whatever aspects it.

When the Navamsa lord outranks the sign lord

Saravali closes its chapter on the Moon in the navamsas with a rule worth knowing, which it attributes to the older Yavana authorities: if the lord of the Moon's Navamsa is stronger than the lord of its sign, then the Navamsa results come to pass rather than the sign results. In other words, the second chart can override the first for the Moon when its lord is the stronger. The text does not give a general rule for every graha in the same words, and this page does not extend it. It is a clear classical statement that the D9 is not merely a supplement for some purposes: the text contemplates it replacing the sign reading outright.

This app does not implement that override - it reports D1 and D9 positions side by side and leaves the weighting to the reader, except where Vimshopaka Bala applies fixed weights. If you want to try the rule on your own Moon, the strengths the engine does compute are in the Shad Bala calculator, and the planet pages - starting with the Moon in Vedic astrology - give the dignities.

Checking a Navamsa by hand

1. 1.Take the planet's sidereal sign and its degree within the sign, from the birth chart calculator.
2. 2.Divide the degree by 3.3333 and drop the remainder; add 1. That is the part, 1 to 9.
3. 3.Find the starting sign: the sign itself if it is movable (Aries, Cancer, Libra, Capricorn), the 9th from it if fixed (Taurus, Leo, Scorpio, Aquarius), the 5th from it if dual (Gemini, Virgo, Sagittarius, Pisces), counting the sign itself as the first.
4. 4.Count forward from the starting sign by the part number, again counting the starting sign as the first. That is the Navamsa sign.
5. 5.Check: if the part is 1 for a movable sign, 5 for a fixed one or 9 for a dual one, the planet is vargottama.

There is also a shortcut that needs no table at all, because of the continuous count: divide the full sidereal longitude, from 0 degrees Aries, by 3.3333, drop the remainder, and take what is left modulo 12. Zero is Aries, one is Taurus, and so on. For the 1990 Moon at 48.92 degrees: 48.92 divided by 3.3333 is 14.7, so 14; 14 modulo 12 is 2; the Navamsa is Gemini, as above.

What this app does with the D9, and what it does not

• The Navamsa calculator reports the D9 sign of the ascendant and nine grahas, each graha's D9 house, and the vargottama list. Nothing is scored.
• The Karakamsa is the D9 sign of your Atma Karaka, whichever of the seven classical grahas is furthest into its sign (BPHS Ch. 32, Sloka 3-8, and Ch. 33, Sloka 1). The grahas in the 12th sign from it are read for BPHS's clauses on expenses and worship, in the D9 and in the birth chart separately, because BPHS never chooses between them.
• In Vimshopaka Bala, the D9 carries 3 of the 20 points shared across sixteen divisional charts, and each of the seven classical grahas earns its share of those 3 by its dignity in its D9 sign.
• The relationship engine's partner read lists your D9 seventh-house sign among up to five partner indicators. It is one of up to three that are matched by sign or element against the other person's ascendant, Moon, Sun and Venus.
• The AI chat is given the vargottama list, not the D9 itself.

The Kundali page's Navamsa card carries the subtitle "Marriage & inner strength", but no engine times a marriage, or any other event, from the D9. Nor does the app claim more precision than its astronomy has: the project's own engineering notes call that layer "not a full ephemeris" and name precise divisional charts such as D9 among the jobs that need Swiss Ephemeris. A point close to a part boundary may land one sign over in another program.

Two charts, kept apart

One design choice in the engine is worth drawing out, because it is easy to get wrong when reading two charts at once. The D9 has its own houses, counted in whole signs from the D9 ascendant, and they are not the birth chart's houses. In the 1990 chart, the Moon is in the 9th house of the birth chart and the 10th of the Navamsa; Venus is in the 11th of one and the 1st of the other. Neither number is the "real" one. They answer the same question - where is the planet counted from the ascendant - in two different charts.

Where the engine reads the D9 for anything, it keeps the two separate. The 12th-from-Karakamsa reading lists the occupants of that sign in the Navamsa and in the birth chart as two lists, never merged, because BPHS does not say which it means. That is the honest way to handle a text that is ambiguous, and it is a good habit for a reader too: when a rule says "in the 7th", find out which chart it means before counting.

Finding yours

You need your birth date, a birth time as exact as you can find, and a birth place. If the time is an estimate, run the Navamsa calculator a few minutes either side of it: if the D9 ascendant changes, you know how much weight that time carries. With no time at all, what an unknown birth time actually costs sets out which parts of a chart survive without one.

Is the Navamsa only for marriage?

No. BPHS Ch. 7 assigns it the spouse in its list of sixteen divisions, but the text uses it far more often as a second test of a graha's dignity - "own Rasi or Navamsa", "exalted in Rasi or Navamsa" - and in yogas, the Karakamsa and longevity.

Is vargottama always good?

The texts do not say so. BPHS associates a vargottama ascendant lord with immunity to diseases and makes a vargottama ascendant the condition for Shatabdik dasha; Saravali gives a vargottama Moon full results, but also says a vargottama ascendant with no planet aspecting it makes royal yogas fail. The engine reports it as a flag, not a score.

Why does my D9 differ from another app's?

Usually the ascendant: its D9 sign changes every 13 minutes or so, so a few minutes of birth time or a small ayanamsa difference moves it. For a planet, check how close it is to a 3 degree 20 minute boundary; an ayanamsa gap of D arcminutes moves a planet across one on about D/200 of the zodiac.

Can I get a Navamsa without a birth time?

The grahas' D9 signs, yes, mostly - they need only the date and, for the Moon, a reasonably known time. The D9 ascendant and D9 houses, no. The calculator refuses rather than drawing a partial chart from a guessed time.

Is a navamsa the same as a pada?

It is the same 3 degree 20 minute slice of sky. Both are counted from 0 degrees Aries, and the 108 padas of the 27 nakshatras line up exactly with the 108 navamsas of the 12 signs, so the pada of any point tells you its Navamsa sign.

Which matters more, the D1 or the D9?

BPHS gives the sign more weight in its Vimshopaka schemes - 6 against 5 in the six-division scheme, 3.5 against 3 in the sixteen-division one - while Saravali records an older view that the Moon's Navamsa results prevail when its Navamsa lord is the stronger. The texts read them together.

Does the app predict events from the D9?

No. It reports positions and the vargottama list, uses the D9 in Vimshopaka Bala, the Karakamsa and the 12th-from-Karakamsa readings, and passes the vargottama list to the chat. No engine times a marriage or any other event from it.