What the Dashamsa is
Vedic astrology does not stop at the birth chart. Brihat Parashara Hora Shastra describes a family of divisional charts, called vargas, each made by cutting every sign into equal parts and giving each part its own sign. The Dashamsa, written D10, cuts each sign into ten parts of three degrees. Its name means the tenth part, and the tradition links it with the 10th house of the birth chart: work, standing in the world and what a person does with their abilities.
A D10 chart is a second layer of the same birth chart and not a separate horoscope. It starts from the same planets and the same ascendant, and it simply asks a finer question about each one. Where the main chart shows the broad picture of your working life, the Dashamsa is read for the character of your profession and public role.
How the calculator works
You give the date, time and place of birth. The calculator converts the local time to universal time, applying the time zone and daylight saving that were in force at your birth place, and reads each planet from the Swiss Ephemeris tables on this site in the sidereal zodiac with the Lahiri ayanamsa. Rahu and Ketu use the mean node. Your ascendant comes from the local sidereal time at the birth place.
Each position then goes through the Parashari rule. In an odd sign, which means Aries, Gemini, Leo, Libra, Sagittarius or Aquarius, the first ten-part falls in the sign itself and the next nine follow in order. In an even sign, which means Taurus, Cancer, Virgo, Scorpio, Capricorn or Pisces, counting starts from the 9th sign from it. For example, a planet at 5 degrees of Aries is in the second part of the sign, so its D10 sign is Taurus. A planet at 5 degrees of Taurus is also in the second part, but Taurus is an even sign, so counting starts from Capricorn, the 9th from Taurus, and the D10 sign is Aquarius.
The result is drawn as a North Indian chart, the same diamond as on our Navamsa calculator, next to your main chart so that you can compare them. A table lists every planet with its position in the birth chart, its part of ten, its D10 sign and its house counted from the D10 Lagna.
Reading your result
Begin with the Dashamsa Lagna, the sign that rises in the D10, and the 10th house from it. These two say the most about how your work life takes shape. Then look at the planets in or aspecting the 10th house, the planet that rules it, and the planets that sit strongly in the chart. A planet that holds a dignified sign in the D10 is traditionally read as giving its results in work with more ease.
The calculator names the 10th house of the D10 and any planets in it. It does not try to sum up a career for you. Dashamsa reading is a craft that combines the chart with the running dasha, which you can find with the Mahadasha calculator, and with the main chart’s 10th house. For that, the free kundali shows the whole chart at once.
Why the birth time matters
The ascendant moves through all twelve signs in a day, which means the D10 Lagna changes about every twelve minutes. A birth time that is out by half an hour can give a different Dashamsa Lagna and so a different chart. The planets, by contrast, hardly shift. If you do not know your time of birth within a few minutes, treat the Lagna and the house placements in the D10 as uncertain, and rely on the signs of the planets instead. You can check your rising sign alone with the Ascendant calculator.
Where traditions differ
The even-sign rule is where teachers part ways. The method used here, counting from the 9th sign, is the Parashari one and the standard in nearly all Indian astrology software. A few schools use other schemes for even signs, such as counting backwards, and some modern writers prefer them. We show the Parashari rule only, and the page says so.
The weight given to the D10 also differs. Some astrologers give it great weight for vocation, while others treat all the divisional charts as supporting evidence for the main chart. Whichever view you take, the Dashamsa is for reflection on work and not a prediction of a job or a salary.
What it does not do
It does not name a career, promise success or warn of failure. If decisions about work are weighing on you, speak with a career counsellor or someone you trust; astrology can add a point of view, and it cannot replace practical advice.
Frequently asked questions
↳ What is the difference between D9 and D10?
The Navamsa (D9) divides each sign into nine parts and is read mainly for marriage and inner strength. The Dashamsa (D10) divides each sign into ten parts and is read for work and public life. Both are layers of the same birth chart.
↳ Do I need my exact birth time for the D10?
Yes, for the Lagna and for house placements. The D10 Lagna changes about every twelve minutes. The planets move far more slowly, so their D10 signs are steadier, but most readings lean on the Lagna.
↳ Which method does this calculator use for even signs?
The Parashari method: in an odd sign the count of ten parts begins from the sign itself, and in an even sign it begins from the 9th sign from it. It is the most widely used rule.
↳ Why does my D10 Lagna differ from another site?
The usual causes are a different birth time or time zone, a different ayanamsa, or a different rule for even signs. Check those three first. If you used the same details and the Lahiri ayanamsa, the Parashari rule should give the same sign.
↳ Does the D10 tell me which career to choose?
No. It is a tool for reflection on the themes of your working life in a tradition. Choose a career from your skills, interests and practical circumstances, and use the chart as one more way of looking at them.