The Trimshamsa (D30) chart is the divisional chart that divides each sign into five unequal segments ruled by Mars, Saturn, Jupiter, Mercury and Venus to show misfortune, adversity and health pressure. Odd and even signs use different segment orders. It shows where difficulty is configured to land, not a verdict on a whole life.
The Trimshamsa is also written Trimshamsha or D-30 (त्रिंशांश), and the older sources call its subject arishta, the category of life difficulties. It is the thirtieth-part varga in the system laid out in Reading the Divisional Charts, a layer of your birth chart rather than a separate horoscope.
The Trimshamsa maps where difficulty is likely to land, not whether a life is difficult overall.
Trimshamsa (D30) at a glance
Fact
Detail
Also known as
Trimshamsa, Trimshamsha, D-30
Division
30th: each 30° sign split into thirty 1° parts, grouped into five unequal segments
Segment structure
Five unequal Parashari segments per sign
Odd-sign segments
Mars 5°, Saturn 5°, Jupiter 8°, Mercury 7°, Venus 5°
Even-sign segments
Venus 5°, Mercury 7°, Jupiter 8°, Saturn 5°, Mars 5°
The Trimshamsa shows where difficulty is configured to land and what resources a chart carries for meeting it. Among the sixteen divisions Brihat Parashara Hora Shastra sets out, it is the one assigned specifically to arishta-vichara, the analysis of adversity, rather than to a life area like marriage or career. Its role is not celebratory: it does not show the yogas that elevate a chart, which the Navamsa and other divisions address. That is a narrower and more sober brief than most of the other vargas.
The name comes from dividing each thirty-degree sign into thirty one-degree parts, but the interpretive structure that matters is built on top of that: those thirty degrees are grouped into five unequal segments, each ruled by one of five planets, and it is the segment a planet falls into, not the individual degree, that carries the reading.
How to find your D30 segment
A planet's D30 segment depends on whether its sign is odd or even and on its degree inside the sign. Charts on this site use the sidereal zodiac with the Lahiri ayanamsha and the Swiss Ephemeris; the method is described under /tools.
Enter your birth date, time and place in the Lagna calculator to get the sign and degree of your Lagna and every planet.
Decide whether the sign is odd (Aries, Gemini, Leo, Libra, Sagittarius, Aquarius) or even (Taurus, Cancer, Virgo, Scorpio, Capricorn, Pisces).
For an odd sign, read the degree against Mars 0° to 5°, Saturn 5° to 10°, Jupiter 10° to 18°, Mercury 18° to 25°, Venus 25° to 30°.
For an even sign, read the degree against Venus 0° to 5°, Mercury 5° to 12°, Jupiter 12° to 20°, Saturn 20° to 25°, Mars 25° to 30°.
The planet named for the span is the sub-ruler of that segment, and its nature colours the reading of the planet placed there.
A worked example. Mars at 22° Gemini, an odd sign. Working through the odd-sign spans in order (Mars 0°-5°, Saturn 5°-10°, Jupiter 10°-18°, Mercury 18°-25°, Venus 25°-30°), 22° falls inside the Mercury segment. Mars, a natural malefic, landing in Mercury's segment is read as difficulty that yields to analytical, careful handling rather than difficulty that escalates through conflict, which is the register Mars would carry in its own segment. The same 22° in an even sign such as Cancer falls in a different segment altogether: even signs run Venus 0°-5°, Mercury 5°-12°, Jupiter 12°-20°, Saturn 20°-25°, Mars 25°-30°, so 22° there sits in the Saturn segment, giving Mars a chronic, slow-developing register instead of an analytical one. The odd-even distinction is not a minor technicality; it changes which of the five planetary registers a degree falls under.
Why do odd and even signs use different segment orders?
The malefics open odd signs and close even signs, and Venus does the reverse. Mars and Saturn, the two natural malefics, together rule ten degrees of any sign in either system, while Jupiter, Mercury and Venus together rule the remaining twenty. What changes between odd and even signs is which end of the sign each planet occupies. The Sun, Moon, Rahu and Ketu are excluded from this sub-rulership scheme entirely; the older sources treat the luminaries as the chart's vital and emotional foundation rather than agents of adversity, and the lunar nodes as transformative rather than steady in the way this specific reading requires.
How do the five segments read adversity?
A planet in the Mars segment carries Mars-flavoured difficulty into the matters it governs: accident-proneness, inflammatory health pressure, conflict. A planet in the Saturn segment carries Saturn-flavoured difficulty: chronic restriction, slow-developing pressure. The three benefic segments modulate rather than remove the adversity reading. A planet in the Jupiter segment tends toward difficulty that produces growth rather than lasting damage; in the Mercury segment, difficulty that yields to careful, analytical handling; in the Venus segment, difficulty arising from relational or aesthetic sources. None of the five segments promises an easy chart, since the whole divisional is built to register where pressure falls, and the benefics simply change its character rather than its presence.
Is the D30 used to read health?
Yes, as one layer among several and always as a preventive, constitutional reading. The Trimshamsa lagna, calculated from the exact rashi lagna degree, shows the constitutional register through which health pressures are mediated: a lagna falling in a Saturn segment suggests a constitution that handles pressure through endurance but may carry chronic concerns, while a Mars-segment lagna suggests inflammatory or accident-prone tendencies. The natal Moon's placement in the D30 is read next, since the Moon governs the body's emotional-nervous register and its Trimshamsa placement shows how that register absorbs difficulty. The placement of the natal lagna lord speaks to the resilience of overall vitality, with a vargottama lagna lord (the same sign in both rashi and Trimshamsa) read as a notably stable configuration. Any specific health concern is a matter for a qualified medical professional, not a chart alone.
What misfortunes beyond health does the D30 cover?
The adversity reading extends across the standard house significations, each addressed through its own house of the D30 chart. Financial pressure reads through the second house; property difficulty through the fourth; career disruption through the tenth; relational strain and separation through the seventh, read alongside the Navamsa's own seventh-house reading of the marriage's general texture; and disputes that escalate into formal proceedings through the sixth. The chart does not deliver one overall verdict on a life's misfortune; it gives category-specific readings, and a careful practitioner consults only the categories relevant to the question actually being asked.
How does dasha timing work with the D30?
The VimshottariMahadasha of a planet poorly placed in the Trimshamsa is classically read as a chapter in which adversity-related significations come into sharper operation: chronic difficulties intensifying, periodic challenges recurring more often. The Mahadasha of a planet well placed in the D30 is read as a period in which those significations recede or are handled with greater capacity. This dasha-level reading turns the Trimshamsa from a static description into a practical timing tool, since it tells a practitioner not just what kind of difficulty a chart carries but roughly when it is likely to be most active.
What are the common misreadings of the D30?
The Trimshamsa is most often misread as a verdict on a chart's overall fortune, when it addresses adversity specifically: a chart with a difficult-looking D30 can still carry a substantially favourable life if the rashi and Navamsa show strong support elsewhere. It is also misapplied as a deterministic health diagnosis rather than one layer among several that a responsible reading integrates with the rashi, the Moon's condition and dasha timing, always alongside qualified medical evaluation for any specific concern. A third common error is dramatising a difficult D30 into a prediction of catastrophe. The classical sources describe where pressure is likely to fall and what resources are available to meet it, not an unavoidable sentence, and the seeker's own engagement, through disciplined practice and cultivated resilience, is treated as part of how the configuration plays out.
Which divisional charts is the D30 read alongside?
It is often read together with the Navamsa (D9) for relational adversity, and with the Shashtiamsa (D60), where birth-time precision allows it, for the karmic substrate beneath the present-life difficulty the Trimshamsa describes. Where the question is whether comfort is being disrupted by misfortune, the Shodasamsa (D16) is the natural partner.
Where to find your D30 segments and lagna
Locating the correct Parashari segment for each planet by hand means knowing whether a sign is odd or even, applying the right unequal spans and reading the resulting sub-ruler correctly, which is an easy calculation to get wrong. A degree near a segment boundary (5°, 10°, 18° and so on) is worth checking against your birth time. Get your degrees from the Lagna calculator and apply the five steps above. The full reading at /kundli/new computes your Trimshamsa lagna and planetary placements automatically alongside your rashi chart.
Frequently asked questions
What does the Trimshamsa (D30) chart show?
The Trimshamsa is the Vedic astrology divisional chart read specifically for misfortune, adversity and health pressure. It divides each sign into five unequal segments ruled by Mars, Saturn, Jupiter, Mercury and Venus, and a planet's segment shows the character of difficulty it is likely to bring to the matters it governs.
How is the Trimshamsa chart different from other divisional charts?
Most divisional charts split each sign into equal parts. The Trimshamsa uses five unequal Parashari segments of 5°, 5°, 8°, 7° and 5° in some order depending on whether the sign is odd or even, and only five of the nine planets serve as sub-rulers rather than all nine.
Can the D30 chart diagnose a specific illness?
No. Classical sources treat it as a constitutional and preventive reading, showing where health pressure is likely to register and in what form, integrated with the natal Moon and lagna lord. Any specific health concern should be evaluated by a qualified medical professional rather than read from the chart alone.
Does a difficult Trimshamsa mean an unlucky life?
No. The chart addresses adversity specifically, not overall fortune. A chart with a challenging D30 can still carry a favourable life if the rashi and Navamsa show strong support in other respects, because the Trimshamsa names where pressure is likely to fall and is not a verdict on the whole life.
Why are the Sun, Moon, Rahu and Ketu excluded from the Trimshamsa's sub-rulership?
The classical texts treat the Sun and Moon as the chart's foundational sources of vitality and emotional life rather than agents of adversity, and Rahu and Ketu as transformative rather than steady in the register this chart requires. Only Mars, Saturn, Jupiter, Mercury and Venus serve as sub-rulers.
