D12 Dwadashamsa Chart: Parents and Ancestry Explained

Dwadasha means twelve, and the Dwadashamsa is the twelfth part of a sign. It is the simplest rule among the equal-part charts, because for every sign the count starts at the sign itself and runs forward, with no odd and even distinction. It is also one of the six charts of the Shadvarga.

What the Dwadashamsa is read for

The tradition links the D12 with parents and the family line: the character of the father and mother, the bond with them, and inherited temperament. The Sun is the natural significator (karaka) of the father and the Moon of the mother. In the Rashi chart the ninth house is classically linked with the father and the fourth with the mother, though some teachers swap them, and the D12 is read with those houses and their lords in mind.

Some astrologers also use it for the wider theme of ancestry and family heritage, which is why it is sometimes described as showing what a person inherits from the line behind them. This is a tradition’s way of speaking and not a record of events, and the chart does not diagnose any family situation.

The reading calls for tact. A D12 does not show whether a parent will be well or unwell or how long they will live, and a careful astrologer does not forecast on such lines. Where family health is a worry, the right guide is a doctor.

How the Dwadashamsa is calculated

The Parashari rule used by the divisional charts calculator divides each sign into twelve parts of 2 degrees 30 minutes. The count begins at the sign itself and runs round the zodiac, one sign for each part, for every sign alike. The first part of Aries is Aries, the second Taurus, and so on to Pisces at the twelfth part. In Taurus the first part is Taurus, the second Gemini, and the twelfth is Aries.

Take a planet at 7°20′ of Libra. Each part is 2°30′ long, so this position lies in part 3 (from 5°00′ to 7°30′). By the rule above, part 3 of Libra is Sagittarius, so the planet sits in Sagittarius in D12.

Because the count starts at the sign itself, the planet’s own sign is always the first of its twelve possibilities, and the whole zodiac is available to a planet in the D12. Dividing the degrees by 2.5 and taking the whole number gives the number of signs to count forward from the sign, which makes the calculation easy by hand.

Sensitivity to birth time

A part of 2 degrees 30 minutes is crossed by the ascendant in roughly ten minutes. The D12 Lagna can therefore differ between two birth times only ten minutes apart. Teachers advise reading the planets by sign in this chart and treating the houses as provisional when the birth time is uncertain.

Where schools differ

The sign rule is stable across Parashari teachers. The main differences are about how to read the chart. Some use the Sun and Moon as the parents’ representatives, and others use the ninth and fourth lords, or the D12 Lagna lord. The assignment of the ninth house to the father and the fourth to the mother is the common one, but some traditions reverse it. Because the chart is rarely taught in detail, there is more variation in interpretation than in calculation.

The relevant points to read in the Rashi chart come from the house guides, the house lord pages and the Pitra Dosha calculator, which looks at ancestral themes through a different, more specific tradition.

How much weight teachers give it

The Dwadashamsa belongs to the Shadvarga, the Saptavarga, the Dashavarga and the Shodashavarga. In the commonly quoted Vimshopaka weights it has 2 out of 20 in the Shadvarga and 0.5 out of 20 in the Shodashavarga. Most working astrologers use it occasionally, when a client asks about parents or family inheritance, and not as a routine part of every reading.

When it is used, it is read alongside the Rashi chart’s fourth and ninth houses, the Sun and Moon, and the periods of the planets that rule them. It is a supporting voice. A concern about a particular parent is best met with conversation and, where appropriate, medical care, and not with a chart.

Reading your own Dwadashamsa

Choose D12 in the calculator and enter your details. Note the sign of the D12 Lagna, the signs of the Sun and Moon, and the lords of the fourth and ninth houses. Compare with the same planets in the Rashi chart. The Mahadasha calculator shows which planets are in operation now.

The preceding chart is the Dashamsa (D10) and the next is the Shodashamsa (D16).

Frequently asked questions