How the Triṁśāṁśa is constructed — the unequal division
Five portions, five lords, five deities. The order runs one way in an odd sign and reverses in an even one. Note that no portion belongs to the Sun or the Moon.
| Odd sign | Degrees | Lord | Deity |
|---|---|---|---|
| 1st portion | 0° – 5° | Mars | Agni |
| 2nd portion | 5° – 10° | Saturn | Vāyu |
| 3rd portion | 10° – 18° | Jupiter | Indra |
| 4th portion | 18° – 25° | Mercury | Kubera |
| 5th portion | 25° – 30° | Venus | Varuṇa |
In an even sign the quantum, the lordship and the deities all reverse: Venus takes the first 5°, Mercury the next 7°, Jupiter 8°, Saturn 5° and Mars the last 5°. This is why a planet at the same degree of Aries and of Taurus lands in completely different hands.
Why the Sun and Moon own nothing here
The five portions belong to Mars, Saturn, Jupiter, Mercury and Venus. The luminaries are excluded from the ownership scheme altogether, which has a practical consequence: the Sun and Moon can never be in their own sign in the D-30. They can reach Aries and Taurus respectively, but never Leo or Cancer. For those two grahas, only exaltation applies in this chart.
The exclusion is not an oversight. The subject of this chart is the flaws that arise from the elemental and instinctual layers of a person, and the two luminaries — the soul and the mind — are what those flaws happen to, not what produces them.
Read vices here, and never in the birth chart
This is the rule that matters most on this page. The ṣaḍ-ripu — the six inner enemies — are read in the D-30 and nowhere else. Reading them from the Rāśi chart is one of the most common and most damaging errors in popular astrology, because the birth chart shows a person's constitution and outward life, not the private failings underneath it.
A Rāśi chart with malefics prominently placed does not describe a bad person. It describes a life with friction in it. The question of character flaw is a separate question with a separate chart, and the two answers are frequently opposite: gentle-looking birth charts with severe D-30s are entirely ordinary, and so is the reverse.
When the D-30 is read, read it plainly. A fault named accurately is more useful than a fault dressed up as a strength, and the chart is specific enough to be worth taking seriously.
How to read the D-30
Start with the D-30 Lagna and the graha that lords the triṁśāṁśa your Lagna falls in. That lord sets the dominant tone of the chart — a Saturn triṁśāṁśa Lagna and a Venus one produce very different kinds of trouble.
Then look for Rāhu and Ketu by occupancy. In this chart the nodes' placement is the single clearest indicator of where difficulty concentrates, and a conjunction of a node with another graha in the D-30 is more significant here than the same conjunction would be elsewhere.
Read the 6th, 8th and 12th of the D-30 for the specific form the trouble takes: the 6th for conflict, debt and illness, the 8th for crisis and hidden matters, the 12th for loss and self-undoing. And read the 3rd, 6th and 11th — the upacaya houses — with the opposite expectation, since malefics placed there grow into strength over time rather than into damage.
The Triṁśāṁśa at a glance
Every figure here is specific to this division. The Vimśopaka rows give the share of the twenty-point strength score the Triṁśāṁśa carries in each classical scheme — a blank means the division is not counted in that scheme at all.
| D30 | |
|---|---|
| Divisions per sign | 5 |
| Arc of one division | 5°–8° (unequal) |
| Divisional Lagna changes every | between 20 and 32 minutes |
| Vimśopaka weight · Ṣaḍvarga (6) | 1 |
| Vimśopaka weight · Saptavarga (7) | 2 |
| Vimśopaka weight · Daśavarga (10) | 1½ |
| Vimśopaka weight · Ṣoḍaśavarga (16) | 1 |
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 Triṁśāṁśa
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 5, so the D30 Lagna moves to a new sign between 20 and 32 minutes — and the planets near a boundary shift with it. If your recorded time is uncertain by more than that, treat the D30 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.