Saptamsa Chart Calculator (D7)

The fifth house covers children, creative production, speculative gain, and the merit a tradition holds is carried into this life. The Saptamsa gives that whole complex a chart. Read for children it describes the themes — the relationship, the timing pattern within a Dasha, what a parent brings to it. Read more broadly it describes what a person generates that outlives the making of it.

Jupiter is the putra karaka and carries this chart. Its Saptamsa sign and house, together with the 5th lord of the birth chart located in the D7, are the two lines that most of a classical reading rests on. The fifth house of the D7 itself — the fifth of the fifth — is the third. Everything else qualifies those three.

Because the odd-even reversal sends even-sign planets six signs away, a D7 computed with a naive divisor is not slightly wrong but wrong by half the zodiac for roughly half the chart. If a D7 from one site disagrees violently with another, this rule is almost always the reason, and it is worth checking which of them applied it before deciding which chart to trust.

Each sign is divided into seven Saptamsas of 4 degrees 17 minutes and roughly 9 seconds. In an odd sign the count starts from the sign itself; in an even sign it starts from the 7th sign from it. The odd-even reversal is the part generic divisor code gets wrong, and getting it wrong shifts every even-sign planet by six signs.

That rule is the whole difference between a divisional chart and a decorative second drawing of the birth chart. The start sign — which sign the parts are counted from — is fixed per varga by classical text and is not the cyclic multiplication most calculators use. The two agree only for divisors 16, 20 and 27.

Parashara gives the Saptamsa in the sixth chapter of the Brihat Parashara Hora Shastra with the odd-even rule above, and assigns it to putra — the fifth house, children. The same chapter's later verses extend the fifth house to purva punya, the merit carried forward, and to intelligence and creative work, which is why the D7 is read for more than progeny in modern practice.

This page states the classical assignment and then declines to use it the way most sites do. Fertility is a medical matter. The tradition's fifth-house readings were written in a world with no diagnostics and are not a substitute for one now, and the honest form of a D7 reading is about the themes around children in a chart, never about whether a particular person can have them.

1. Find Jupiter first Jupiter is the significator of children in this system. Its dignity and house in the D7 is the opening line of the reading. Well placed, the fifth-house themes are described as supported; afflicted, as requiring attention — which in a responsible reading means attention, not a prognosis.
2. Locate the birth chart's 5th lord in the D7 The 5th lord seen in the Saptamsa is the specific line about the fifth house over a lifetime, as against its condition at birth. It is the placement to read before the D7's own fifth house, because it carries the chart's own promise into the division.
3. Read the fifth house of the D7 and its lord The fifth of the fifth. Sign, occupants and lord. As everywhere else, an empty house moves the reading to the lord, and an empty fifth house in a D7 says nothing on its own.
4. Read the chart for creative work as well as for children The fifth house is not only progeny. Anything a person makes and then lets go of belongs to it: teaching, writing, building something that continues without you. For many charts this is the more useful reading of the D7, and it is the one that carries no risk of being mistaken for a medical claim.
5. Stop before fertility Whether a person can have children is a question for a doctor. The classical texts contain verses that read as answering it; they were written without diagnostics and they do not answer it. A Saptamsa reading that crosses that line has stopped being astrology and started being harm.

A planet occupying the same sign in the birth chart and in the D7 is vargottama in this division — literally 'best in division'. The reading is stability rather than strength: the planet is doing the same thing at two resolutions of one chart, so whatever it signifies is consistent rather than conditional. The result table above marks them.

Two cautions. A consistently difficult placement is also vargottama, and the reading is then that the difficulty is stable. And in the D12 and the D60 the division counts from the sign itself, so a planet at the very start of a sign is vargottama by construction rather than by merit — a property of the rule and not a dignity. The vargottama calculator checks every planet against every division at once.

A wrong divisional chart does not look wrong. It renders cleanly, it is internally consistent, and nothing warns you — which is why the same three mistakes have propagated across the internet for twenty years. All three come from computing a varga with arithmetic instead of with its classical rule.

The cyclic shortcut. Multiplying the sign index by the divisor and taking the result modulo twelve is a tempting one-liner and it agrees with Parashara only for divisors 16, 20 and 27. For 12 and 60 it always yields a multiple of twelve — Aries — so it discards the planet's own sign and puts an entire chart in one sign. A D12 or D60 in which every planet shares a sign is this bug, and it is common enough that most readers have seen one without recognising it.

The missing odd-even reversal. The D7 counts from the 7th sign in an even sign and the D10 from the 9th. A generic divisor ignores both, which displaces every even-sign planet by six signs in a D7 and eight in a D10 — roughly half the chart, moved half the zodiac, with no symptom at all.

Treating the D30 as an equal division. The Trimsamsa has five unequal bands per sign, reversed in even signs. Dividing by thirty instead produces a chart that is wrong at every degree of every sign, and one that shows planets in Cancer or Leo — signs a real Trimsamsa cannot contain.

The check for this varga: planets in even signs are displaced six signs from where a plain seven-part division would put them, because the count starts from the 7th sign in an even sign. If a D7 you have been given anywhere fails that test, the start-sign rule was not applied and every placement in it is suspect.

The start-sign rules this site uses are stated in the engine and pinned by a test against a hand-derived chart, with a published citation for each of the sixteen. That is not a claim of infallibility; it is a claim that the rules are written down where they can be checked, which is the only kind of claim a calculator can honestly make.

A Saptamsa division is 4 degrees 17 minutes wide. The ascendant moves through roughly one degree every four minutes of clock time, so the D7 ascendant holds for about 17 minutes before it changes sign. That figure is an average: the rate varies with latitude and with which sign is rising, and near the poles it varies a great deal.

Planets are far steadier than the ascendant, which is why a rounded birth time damages a divisional chart unevenly rather than uniformly. The Moon is the fastest of them and changes Saptamsa about every 7.8 hours; the Sun takes around a month per sign in the birth chart and correspondingly longer per division; Jupiter and Saturn are effectively fixed across a whole day. So if your recorded time is uncertain, distrust the ascendant first and the Moon second, and read the slow planets with confidence.

This page assumes a rectified birth time — a time established or confirmed against events, rather than one recalled to the nearest quarter hour. Every divisional chart beyond the D9 is highly sensitive to birth time, and the finer ones are not merely less reliable on a rounded time but arbitrary: at half a degree per division the D60 ascendant changes about every two minutes, so a time rounded to five minutes leaves two or three equally likely charts and no way to choose between them. If you do not have a time you trust, the honest thing is to read the birth chart and the Navamsa and stop there.

The ascendant is not a property of the instant alone. It is the point of the ecliptic rising over a particular horizon, so it is a function of the moment and of the coordinate together, and the two trade off exactly: the sky turns one degree every four minutes, and one degree of longitude is four minutes of local time. Moving 4 degrees 17 minutes of longitude — about 442 km east or west at Indian latitudes — moves the ascendant by one whole Saptamsa part, which is to say it hands you a different D7 ascendant and rotates every house in the chart above.

Latitude matters separately and less obviously. It does not shift the clock, it changes how fast each sign climbs — the ascensional difference — so two places on the same meridian and the same instant still rise different degrees, and the gap grows the further from the equator you are. This is why a chart cast for a state capital is not a rounding of a chart cast for a village two districts away; it is a different chart that happens to look plausible.

So enter the town you were actually born in. The place search above accepts any village, town or city a geocoder knows, not a shortlist of metros, and it prints the latitude, longitude and timezone it used above the result so you can check them against a map. Since a D7 division is the unit this page is built from, a birth place picked for convenience damages the result in the same way and by the same mechanism as a birth time rounded to the nearest quarter hour.

The D7 does not diagnose fertility, predict conception, or indicate the number or sex of children. It cannot. Any tool producing those from a divisional chart is generating text, and on this subject the text does damage.

A difficult D7 is not a statement that a person will be childless, and a strong one is not a promise of the opposite. Both readings have been used to cause real distress in real families, which is why this page states the limit before the reading rather than after it.

Nothing on this page is medical advice. If children are the reason you are reading it, the useful next step is a doctor, and no chart should delay one.

Two limits apply to every page in this family and are worth stating in one place. Divisional charts beyond the D9 are highly birth-time sensitive, and every reading here assumes a rectified birth time. And nothing on this site is medical, legal or financial advice: a chart is a traditional interpretive framework, not a diagnosis, not a forecast, and never a reason to delay professional help.

Parashara's sixteen divisions are a single instrument, not sixteen instruments. The birth chart is cut at sixteen different resolutions — halves, thirds, quarters, sevenths, ninths, tenths, twelfths, sixteenths, twentieths, twenty-fourths, twenty-sevenths, thirtieths, fortieths, forty-fifths and sixtieths — and a planet's condition is judged from how it behaves across them rather than from any one. The D7 is one of those sixteen and is read in that company.

The weighting is called Vimshopaka Bala, twenty-point strength, and it is where the tradition states which divisions carry most. D1, D9 and D60 take the largest shares; the D2, D3, D7, D10 and D12 sit in the middle; the D16, D20, D24, D27, D40 and D45 carry least. That ordering is worth respecting. A reading built on a minor varga against the evidence of the major ones is almost always reading a birth-time error.

Two of the sixteen are not equal divisions and must never be computed with a generic divisor. The D30 Trimsamsa has five unequal bands per sign, reversed in even signs. The D60 Shashtiamsa is an equal division for the rashi but its sixty deities are enumerated forwards in odd signs and backwards in even ones. Beyond those, the start-sign rule differs per varga and only coincides with the cyclic shortcut for divisors 16, 20 and 27 — for 12 and 60 the shortcut collapses the whole chart into Aries. Every chart on this site uses the classical rules, which are pinned by a test against a hand-derived chart.

D8 Ashtamsa and D11 Rudramsa are deliberately absent from this engine and from this site. They are not part of Parashara's sixteen, and the published rules for them disagree with each other, so there is no single chart to compute. Publishing one would mean choosing a rule and not saying so.