Shadbala: How the Strength of a Planet Is Actually Measured

Somewhere in most consultations the question arrives in the same shape. Is my Jupiter strong? Is my Saturn weak? The person asking wants a yes or a no, and underneath the question sits an assumption that deserves a hard look: that a strong planet is good news and a weak one is a problem. Classical astrology gives a more precise answer than yes or no, and a less comforting one. It measures strength in numbers, six separate kinds of it, and then says plainly that the number tells you nothing about whether you will enjoy the results.

The measurement is called Shadbala, which is simply Sanskrit for six strengths. Brihat Parashara Hora Shastra sets out six sources of strength for each of the seven planets from the Sun to Saturn, and gives working arithmetic for every one of them. Editions of the text number their chapters differently, so rather than quote a chapter number that may not match your copy, we will cite the chapter by its subject: the evaluation of planetary strengths, which Parashara places alongside his treatment of ishta and kashta phala, a planet's capacity for pleasing and for painful results. That placement is the key to the whole subject, and we will come back to it.

Two pieces of housekeeping before the six. The unit of Shadbala is the virupa, also called the shashtiamsa; sixty virupas make one rupa, and final scores are quoted in rupas. And Rahu and Ketu sit outside the scheme entirely. The nodes have no Shadbala. Their condition is judged from their sign, their dispositor and the company they keep, which is a separate method and a separate essay.

Sthana Bala, the strength of position

The first and largest strength asks where the planet stands, and it is itself a bundle of five measurements. Uchcha bala measures the distance from the planet's point of deepest exaltation: Saturn at 20 degrees of Libra holds the full sixty virupas of this component, Saturn at 20 degrees of Aries holds none, and every position between the two earns a proportional share. Saptavargaja bala takes the planet's dignity across seven vargas, the rasi itself and six divisional charts from the hora down to the trimsamsa, and pays it for sitting in own, friendly or exalted portions in each. The remaining three are smaller: a credit for occupying an odd or even sign and navamsa according to the planet's nature, with the Moon and Venus paid for even placements and the rest for odd; a credit of sixty virupas for standing in a kendra, thirty in a panaphara house and fifteen in an apoklima; and a small drekkana credit tied to which third of its sign the planet occupies.

What all five are measuring, in plain terms, is the ground under the planet's feet. A planet near its exaltation degree, in friendly divisions, in an angle, is a person standing on firm ground in their own country. The same planet debilitated and cadent is the same person far from home with no papers.

Dig Bala, the strength of direction

Each planet has one angle of the chart where the tradition says it faces the right way. Mercury and Jupiter hold full Dig Bala in the first house, the eastern horizon. The Sun and Mars hold it in the tenth, the top of the sky. Saturn holds it in the seventh, the western horizon, and the Moon and Venus hold it in the fourth, the bottom. At the opposite point the component falls to zero, and it grades smoothly in between.

The picture behind the rule is a working day. Counsel and learning belong to the morning horizon, so the teacher and the minister rise in the east. Authority is at its most visible overhead, so the king and the commander take the midheaven. Rest, water and home sit at the bottom of the sky, where the mother and the lover of comfort do their work. The end of the day belongs to the west, and the west belongs to Saturn. A planet with full Dig Bala is doing its own kind of work in its own part of the sky.

Kala Bala, the strength of time

The third strength is a bundle of clocks, and it is where the arithmetic gets dense. Nathonnatha bala splits the planets by day and night: the Moon, Mars and Saturn are stronger in a night birth, the Sun, Jupiter and Venus in a day birth, and Mercury collects this credit at all hours. Paksha bala follows the fortnight: benefics gain while the Moon waxes and malefics while it wanes, and the Moon's own paksha bala is doubled, which is part of why a full Moon and a new Moon behave like two different planets in practice. Tribhaga bala cuts the day into three parts and the night into three parts and hands each part to a lord, with Jupiter collecting it in every part. Then come the lords of the calendar: the lord of the year of birth earns fifteen virupas, the lord of the month thirty, the lord of the weekday forty five, and the lord of the hora, the planetary hour, sixty. Notice the direction of that scale. The nearer the clock stands to the moment of birth, the more it pays. Ayana bala reads declination, the planet's distance north or south of the celestial equator, and pays the Sun, Mars, Jupiter and Venus for northerly positions, the Moon and Saturn for southerly ones, and Mercury for both. Last comes yuddha bala, the war correction. When two of the five true planets stand within a degree of each other the texts call it graha yuddha, a planetary war, and strength moves from the loser to the winner.

Cheshta Bala, the strength of motion

Cheshta means effort, and this strength belongs only to the five true planets, because it is about how a planet moves against the zodiac. The texts grade the motions from the fast direct march down through slowing, station and retrogression, and the scale runs opposite to common sense: a planet racing along close to the Sun earns little, while a slow, stationary or retrograde planet earns the most, up to the full sixty virupas. There is an honest piece of astronomy underneath. A retrograde planet is a planet near its closest approach to the Earth, at its largest and brightest in the night sky. The observers who built these rules could see that a retrograde Mars outshines everything around it, and they scored it accordingly. The Sun and the Moon never retrograde, so the scheme gives each a stand-in: the Sun's ayana bala is counted as its cheshta, and the Moon's paksha bala serves the same office.

Naisargika Bala, the natural strength

The fifth strength is fixed before your birth and after it. The Sun holds the most, then the Moon, Venus, Jupiter, Mercury, Mars and Saturn in descending order, each step one seventh of sixty virupas. The order is the order of brightness as seen from Earth, and it is identical in every chart ever cast. It separates nobody from anybody. What it does is settle ties, and it quietly writes the tradition's sense of hierarchy into the total: between two otherwise equal planets, the scheme leans toward the brighter one.

Drik Bala, the strength of aspects

The last strength is the planet's social situation. Every aspect a planet receives is graded on a sixty point scale that peaks at exact opposition, with the special aspects of Mars, Jupiter and Saturn counted at their full values. Aspects from benefics add to the score and aspects from malefics subtract from it, and the net figure, positive or negative, is the Drik Bala. It is usually the smallest of the six components, but because it is the one that can fall below zero it decides borderline cases. A planet watched by Jupiter crosses a line that the same planet watched by Saturn does not.

The totals, and what counts as strong

The six components are summed in virupas and divided by sixty, and the planet's Shadbala is quoted in rupas. There is no single pass mark. Each planet has its own required minimum, and the table most practitioners work from appears in B. V. Raman's Graha and Bhava Balas, the manual through which most of us first learned the computation:

The working figure is the ratio between the strength a planet achieved and the strength it requires. Above one, the planet is fit to act. Well below one, it is not, whatever its placement seemed to promise.

Nobody should compute all this by hand more than once, though doing it once is the best training this subject offers. It takes an afternoon, an ephemeris and the planet's declination, which is why everyone now lets software do it. Different programs also disagree in the second decimal place, because the cheshta and ayana arithmetic can be implemented in more than one defensible way. The disagreement rarely changes the ranking of the planets, and the ranking is what you actually use.

Strength is capacity, not kindness

Now the part that almost every popular explanation gets wrong. A high Shadbala score does not mean the planet will treat you well. It means the planet has the power to act. What it will do with that power is a different question, answered by different tools: the houses it rules from your lagna, the house it occupies, the yogas it joins, its ishta and kashta figures. Parashara computes strength and beneficence separately because they are separate things. One is the volume, the other is the song.

Take a chart where Saturn rules the eighth house and sits in it with a Shadbala of seven rupas against a requirement of five. That Saturn is magnificently strong, and what it is strong at is eighth house business: delay, upheaval, inheritance, the slow grinding of circumstances. It will deliver that agenda punctually and thoroughly. A weak malefic mutters its threats; a strong one keeps them. The reverse case is just as common. Jupiter as your dasha lord, promising marriage and wealth from the ninth house, holding four rupas against a requirement of six and a half, is a generous friend with an empty wallet. The promises are real and the delivery is feeble.

So the order of reading matters. First establish what a planet has promised, from lordship, occupation and yoga. Then use Shadbala to judge whether it can keep the promise. Strength read on its own flatters malefics and slanders weak benefics, and that single confusion produces most of the bad advice this subject attracts.

Be clear, too, about what Shadbala is not. It is not the strength of houses; bhava bala is its own computation. It does not see yogas at all, and two planets forming a rajayoga can both be modest in Shadbala while the yoga still operates. It says nothing about the nodes. It is one instrument on the bench, the most finely graduated one, and it answers exactly one question: how much force does this planet have at its disposal.

Reading your own numbers

Where the measurement earns its keep is the dasha sequence. A mahadasha lord above its required strength runs a period in which its agenda actually happens, for better and for worse. A lord well below strength runs a muffled period, promises deferred, events arriving late and smaller than advertised. And when two planets both claim the same signification, career from the tenth lord and career from the Sun, say, the stronger claim usually wins the argument.

The first step is seeing the chart itself. A free kundali gives you the computed chart this whole subject runs on, with positions cast from the Swiss Ephemeris rather than copied out of a panchang table. The second step is the judgment, which is where the arithmetic stops helping: what a strong eighth lord or a weak dasha lord means in your particular life is a question about your chart, not about charts. Ask it plainly, in your own words and your own language, at Ask Acharya. A useful answer names your planets and your houses, not planets in general.

The tradition took the trouble to measure strength six different ways and to keep strength and goodness in separate ledgers. Anyone reading a chart owes it the same care: find out how strong the planet is, then find out what it is strong at, and only then say whether that is good news.

Sources

• Brihat Parashara Hora Shastra, the chapter on the evaluation of planetary strengths (chapter numbering varies between editions), which enumerates Sthana, Dig, Kala, Cheshta, Naisargika and Drik bala with their sub-strengths and virupa values, and the adjoining treatment of ishta and kashta phala.
• B. V. Raman, Graha and Bhava Balas, the working manual for the computation; the table of required Shadbala minimums per planet follows it.