Dasamsa Chart Calculator (D10)

The tenth house is karma in its plainest sense — what a person does where others can see it. The Dasamsa gives that a chart, and it is read for the *kind* of work rather than the name of the job: whether authority is exercised or served, whether the work is public or hidden, whether status arrives early and holds or arrives late and lasts.

The single most useful placement is the birth chart's 10th lord seen in the Dasamsa. That one line describes what happens to the career over a lifetime rather than what it looks like at the start, and it is the placement classical readings open with. The D10 ascendant and its lord frame it; the tenth house of the D10 itself — the tenth of the tenth — is the third line.

The Sun is the karaka of authority and Saturn of the work itself, the labour and the discipline; Mercury governs trade and communication, Jupiter counsel and teaching, Venus the arts and anything transactional that has to be pleasant. Reading which of those is strongest in the D10 and where it sits is how a career reading gets specific without inventing a job title the chart cannot know.

Each sign is divided into ten Dasamsas of 3 degrees. In an odd sign the count starts from the sign itself; in an even sign it starts from the 9th sign from it. The odd-even reversal is classical and is the step a generic divisor misses, which moves every even-sign planet eight signs from where it belongs.

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 Dasamsa in the sixth chapter of the Brihat Parashara Hora Shastra and assigns it to karma — the tenth house, action in the world. Jaimini's system reads it too, and the Dasamsa is one of the few vargas both great schools use for the same question, which is part of why it has survived into modern practice more intact than most.

In the Vimshopaka weighting the D10 is worth less than the D9 and more than the smaller divisions, which is a fair statement of how it should be used: it is the second chart of a career reading, not the first. The tenth house of the birth chart, its lord, and the Sun and Saturn as karakas come first, and the Dasamsa refines what they already say.

1. Read the D10 ascendant and its lord The Dasamsa lagna is the working self: the posture a person takes in public. Its lord's placement in the D10 says where that posture actually operates — in a kendra it is structural and visible, in a dusthana it is applied to difficulty, service or things that stay behind the scenes.
2. Locate the birth chart's 10th lord in the D10 The line to read before any other. A 10th lord that is dignified in the Dasamsa describes a career that consolidates; one that falls into a difficult house there describes a career that is real but keeps meeting friction it has to solve rather than avoid.
3. Read the tenth house of the D10 and its occupants Sign, occupants, lord. The tenth of the tenth is the most specific statement the chart makes about the eventual standing rather than the starting point. An empty tenth house here moves the reading to its lord in the usual way.
4. Weigh the Sun and Saturn against each other The Sun is authority, Saturn is labour. Both strong is the signature of work that carries responsibility. Sun strong and Saturn weak reads as position without grind; Saturn strong and Sun weak as grind without visible position. Neither is better; they describe different working lives.
5. Bring in the Dasha before saying anything about timing The D10 is a standing description of a career and contains no dates. Whether a period supports advancement is a Vimshottari question, read from the Mahadasha and Antardasha lords and their relationship to the tenth house — with the D10 saying how durable the resulting position is.

A planet occupying the same sign in the birth chart and in the D10 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 eight signs from a plain ten-part division, because the count starts from the 9th sign in an even sign. If a D10 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 Dasamsa division is 3 degrees wide. The ascendant moves through roughly one degree every four minutes of clock time, so the D10 ascendant holds for about 12 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 Dasamsa about every 5.5 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 3 degrees of longitude — about 310 km east or west at Indian latitudes — moves the ascendant by one whole Dasamsa part, which is to say it hands you a different D10 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 D10 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 Dasamsa does not name a profession. There is no mapping from a sign to an occupation that survives contact with a real labour market, and a tool that prints one has generated a plausible sentence rather than read a chart.

A difficult D10 is not a statement that a person will fail at work. Education, opportunity, health, capital and the economy decide careers, and this chart contains none of them.

Nothing here is career advice, and it is not a reason to take or leave a job. A chart is a description; a decision about work is yours and belongs with people who know your actual situation.

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 D10 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.