How the Dvādaśāṁśa is constructed
Each sign is divided into twelve parts of 2°30' each — the simplest counting rule of all sixteen.
- Every sign, without exception
- The twelve divisions run successively from the sign itself. The dvādaśāṁśas of Aries are Aries, Taurus, Gemini and so on through Pisces; those of Taurus begin at Taurus.
- Why it is unusually clean
- There is no odd/even or movable/fixed rule to apply, so programs almost never disagree about a D-12. If two tools give you different Dvādaśāṁśa charts, the discrepancy is in the ayanāṁśa or the birth time, not in the division.
Reading the mother and the father
The 4th house of the D-12 carries the mother and the 9th the father, as they do in the birth chart. Read each with its lord, and read the natural significators alongside — the Moon for the mother, the Sun for the father.
Then rotate. To read the mother's own life rather than your relationship with her, treat the 4th house of the D-12 as a Lagna and read the chart from there; the 10th from that point becomes her career, the 7th her marriage, and so on. The same rotation from the 9th gives the father. This is where the D-12 does work that the birth chart cannot.
The 12th of the D-12 is worth checking in any question about an ancestor's unfinished business, and the 8th for what was hidden or unresolved in the line — the two houses through which inherited difficulty most often expresses itself.
What "inherited karma" means here
The claim in this chart is narrower and more useful than it sounds. It is not that your ancestors' deeds are visited on you as punishment. It is that a person is born into a particular set of conditions, expectations, debts and advantages, and that these shape a life before any choice is made.
The D-12 is where those conditions are read. A strong, clean D-12 describes a person supported by their origins — not necessarily wealthy, but not fighting the house they came from. A heavily afflicted one describes a person whose starting conditions were themselves an obstacle, and who spends a portion of their life resolving something they did not create.
The Dvādaśāṁśa at a glance
Every figure here is specific to this division. The Vimśopaka rows give the share of the twenty-point strength score the Dvādaśāṁśa carries in each classical scheme — a blank means the division is not counted in that scheme at all.
| D12 | |
|---|---|
| Divisions per sign | 12 |
| Arc of one division | 2°30' |
| Divisional Lagna changes every | about 10 minutes |
| Vimśopaka weight · Ṣaḍvarga (6) | 2 |
| Vimśopaka weight · Saptavarga (7) | 4½ |
| Vimśopaka weight · Daśavarga (10) | 1½ |
| Vimśopaka weight · Ṣoḍaśavarga (16) | ½ |
Counted in 4 of the four schemes. The more schemes a division appears in, the more the tradition treats it as load-bearing rather than specialist.
How accurate your birth time needs to be for the Dvādaśāṁśa
The Rāśi Lagna moves through a whole sign in roughly two hours, which is why the birth chart tolerates an approximate time. This division cuts each sign into 12, so the D12 Lagna moves to a new sign about 10 minutes — and the planets near a boundary shift with it. If your recorded time is uncertain by more than that, treat the D12 Lagna and any house-based conclusion drawn from it as provisional, and rectify the time against dated life events before relying on it. Sign placements of the slower grahas stay stable much longer than the Lagna does.
How this is computed
Positions come from an astronomical ephemeris, converted to the sidereal zodiac on the Lahiri (Citrapakṣa) ayanāṁśa and computed by our own Parāśara engine — no pre-written results, and no language model anywhere near a number. Where the classical texts disagree, this page names the convention we follow instead of quietly picking one.