What is Shodashavarga?

Shodashavarga means "the sixteen divisions" — shodasha, sixteen, and varga, a division. It is the canonical set of sixteen divisional charts described in the Brihat Parashara Hora Shastra, and it represents the fullest form of the varga scheme. Smaller working sets exist and are drawn from the same list: the Shadvarga of six, the Saptavarga of seven, the Dashavarga of ten. The Shodashavarga is the complete collection from which those subsets are taken.

Each varga is produced by cutting every sign of the birth chart into a fixed number of equal parts and mapping those parts onto signs of a new chart. No new astronomical data enters the process. All sixteen charts are arithmetic consequences of the same planetary longitudes computed for the moment of birth, which is why in Vedic they are generated together from a single set of positions.

The Sixteen Divisions and What Each Covers

D1 Rashi — the birth chart itself, each sign taken whole. Body, physical life and the frame within which all other divisions are interpreted.
D2 Hora — each sign halved. Wealth and accumulated resources. The two halves are assigned to the Sun and the Moon rather than to twelve signs, which makes it structurally unlike the others.
D3 Drekkana — each sign in three parts of 10 degrees. Siblings, courage, initiative and self-effort.
D4 Chaturthamsa — four parts of 7 degrees 30 minutes. Property, fixed assets, home and domestic fortune. Also called Turyamsa.
D7 Saptamsa — seven parts. Children and progeny, and by extension creative issue.
D9 Navamsa — nine parts of 3 degrees 20 minutes. Marriage, the spouse and dharma. The most consulted division after the D1, and the basis of the vargottama concept.
D10 Dasamsa — ten parts of 3 degrees. Career, profession, authority and public standing.
D12 Dwadasamsa — twelve parts of 2 degrees 30 minutes. Parents, ancestry and inherited circumstance.
D16 Shodasamsa — sixteen parts. Vehicles, conveyances, comforts and general happiness. Also called Kalamsa.
D20 Vimsamsa — twenty parts. Spiritual practice, worship, devotion and religious inclination.
D24 Chaturvimsamsa — twenty-four parts. Education, learning and scholarship. Also called Siddhamsa.
D27 Bhamsa — twenty-seven parts, one for each nakshatra. Inherent strengths and weaknesses, constitution and stamina. Also called Nakshatramsa.
D30 Trimsamsa — thirty parts. Misfortune, adversity and moral character. Its divisions are assigned to the five non-luminary planets in unequal spans, so it too departs from the uniform pattern.
D40 Khavedamsa — forty parts. Auspicious and inauspicious effects generally, traditionally connected to the maternal line.
D45 Akshavedamsa — forty-five parts. Conduct, character and moral disposition, traditionally connected to the paternal line.
D60 Shashtiamsa — sixty parts of 30 minutes each. The finest division, read as a summary of accumulated past merit and given substantial weight in strength calculations.

Why Sixteen and Not More

The set is not an arbitrary list. Its members increase in fineness, so the sequence moves from the coarse view of the rashi chart down to the 30-minute slices of the D60, and each level is held to describe a subtler layer of the same life. The domains assigned to each chart largely follow house significations: the third house governs siblings and the D3 is read for siblings, the fourth governs property and the D4 is read for property, the ninth governs dharma and the D9 is read for dharma. Where a division's number exceeds twelve the correspondence is looser and rests on tradition rather than on that rule.

Vimshopaka Bala: Strength Across the Set

The practical purpose of computing many divisions is to test whether a planet holds its dignity consistently. The classical measure for this is vimshopaka bala, a weighted score out of twenty in which each varga contributes a fixed share and a planet earns points for occupying a friendly, exalted or own sign in that varga. Separate weighting schemes exist for the Shadvarga, Saptavarga, Dashavarga and Shodashavarga; in every one the rashi chart and the navamsa carry the largest weights.

Read the birth chart and establish what it promises.
Consult the varga matching the question — D10 for career, D7 for children, D24 for education.
Note any vargottama planets, holding the same sign in a division as in the D1.
Compare a planet's dignity across several divisions rather than trusting one alone.
Bring in dasha timing, since the vargas describe quality and not the moment of an event.

The finer divisions demand an accurate birth time. In the D60 each part spans 30 minutes of arc, which the ascendant crosses in about two minutes, so a small recording error can change the chart substantially. The ayanamsha in use has a similar amplified effect at these resolutions and can be compared on the ayanamsha calculator. Charts and their divisions are generated from the Kundali section.

Frequently Asked Questions

Do I need to read all sixteen divisional charts?

Very few astrologers do routinely. Most work with the D1, D9 and D10 and consult others when a specific question calls for one. The full set exists in Vedic so that a chart can be examined at whatever depth is wanted, not because every reading requires all sixteen.

Why do the D2 and D30 look different from the others?

Because their divisions are not assigned to twelve signs in the usual way. The D2 splits each sign into two halves ruled by the Sun and the Moon, and the D30 divides each sign into five unequal spans allotted to Mars, Saturn, Jupiter, Mercury and Venus, with the order differing between odd and even signs. Both are genuine members of the Shodashavarga despite the irregular construction.

What is the difference between Shadvarga, Dashavarga and Shodashavarga?

They are nested working sets of six, ten and sixteen divisions respectively, each drawn from the same list. Which set an astrologer uses determines the weighting applied when calculating vimshopaka bala, so a planet's strength score depends on which scheme is stated.

How accurate must my birth time be to use the full set?

Coarse divisions such as the D2 and D3 tolerate an error of many minutes. The D30 and beyond do not — the D60 in particular is regarded as requiring a birth time accurate to within a minute or two. Where the recorded time is uncertain, the higher divisions are best treated with caution.