Trimsamsa (D30): the five unequal parts of each sign

Last updated 25 October 2026

Fill in your birth details to find each planet’s trimsamsa: which of the five unequal parts of its sign it occupies, the lord of that part and its D30 sign. After the calculator: the classical rule, a calm explanation of what astrologers read from this chart, and questions that keep the conversation practical.

How the trimsamsa divides a sign

Most divisional charts cut a sign into equal slices. The trimsamsa does not. Despite its name, which means “thirtieth part”, Parashara gives it only five parts per sign, of unequal width, each owned by one of the five planets that rule two signs each: Mars, Saturn, Jupiter, Mercury and Venus. The Sun and the Moon own no trimsamsa.

In an odd sign the order runs Mars for the first five degrees, then Saturn for five, Jupiter for eight, Mercury for seven and Venus for the last five. Even signs run the sequence backwards, Venus, Mercury, Jupiter, Saturn, Mars, and mirror the widths too. A planet takes the sign of the lord whose part it falls in: in odd signs the lord’s odd sign (Mesh for Mars, Kumbh for Saturn, Dhanu for Jupiter, Mithun for Mercury, Tula for Venus), in even signs its even sign. The table below is computed from that rule.

The calculator works from your date, clock time, UTC offset and place of birth (a listed city or your own latitude and longitude). It finds positions in the sidereal zodiac (Lahiri ayanamsa), then reports for every planet and the Lagna which of the five parts it is in, the lord of that part, and the resulting D30 sign. Because the parts are wide, the Lagna stays in one for roughly twenty to thirty-five minutes depending on the part (the actual time varies with the sign and the latitude), so the D30 Lagna is less fragile than the Lagna of the finer charts, though a time close to a change still deserves checking, and you will see a warning if yours is.

The five parts of odd and even signs

One consequence: Kark and Singh never appear in a trimsamsa chart, so a D30 Lagna or planet can occupy only ten signs.

What an astrologer reads in the D30

Classical texts link the trimsamsa with adversity: the setbacks, illnesses and pressures a life may meet. That description puts some people off, and it has been used by careless practitioners to alarm clients. A more useful way to think about it is as a chart of how you meet difficulty. Everyone has hard stretches; the D30 is read for the style of the struggle and, just as much, for the resources that see a person through it.

In a consultation an astrologer will usually look at which lord rules the part a planet falls in, and how that lord gets on with the planet. A planet in the trimsamsa of a friendly lord is read as working with less friction; one in the part of a hostile lord as carrying more strain in its affairs. Benefic lords, Jupiter and Venus, are read as easing; Mars and Saturn as testing, which can also mean toughening. The D30 Lagna and its lord, and the condition of the birth-chart Lagna lord in this chart, describe overall resilience.

Three cautions matter here. First, a D30 placement only means something when the birth chart and the running dasha point the same way; on its own it is a detail, not a forecast. Second, nothing in this chart is a reason to delay medical care or to replace a doctor’s advice: if a question concerns health, see a qualified professional. Third, be wary of anyone who reads the D30 and then insists on an expensive remedy. Our guide to warning signs of a fake astrologer describes that pattern.

Read in the right spirit, the trimsamsa can be one of the more practical charts. Knowing that your pressure tends to come through overwork rather than conflict, or through scattered attention rather than rigid habits, gives you something concrete to manage.

Questions to ask your astrologer about your D30

• How are you using the trimsamsa: as a description of pressure points, or as a prediction?
• Which part lord matters most in my D30, and is it friendly to the planet it holds?
• Does the birth chart support what you see here, or is this a D30-only detail?
• Which dasha would bring this placement into play, if any?
• What practical steps, not purchases, would you suggest from this reading?

For a wider list of questions that keep a reading grounded, see questions to ask an astrologer.