Sookshma and Prana Dasha: Lengths, Formula and Birth Time

Five Levels of One Proportion (सूक्ष्म और प्राण दशा)

Vimshottari divides 120 years among nine lords, and then divides each lord’s share again in the same ratio. The first cut gives the mahadasha, the second the antardasha (also called bhukti), the third the pratyantar dasha. Software that goes further prints two more levels: the sookshma dasha, sometimes spelled sukshma, and below it the prana dasha. Sookshma means subtle or fine, and prana breath, and both names describe size rather than a different kind of period. Nothing new enters at levels four and five. They are the same proportion applied a fourth and a fifth time.

This page works out how long those periods actually are, which a printout gives as dates without comment, and then sets them beside the precision of the birth time that every one of their dates hangs from.

The Length Formula

Inside any period, the sub-period of a lord takes that lord’s share of 120. Saturn’s share is 19/120, so a Saturn sub-period always fills 19/120 of whatever contains it, at every level. Multiplying down the chain gives each level’s length as the product of its lords’ years divided by a power of 120:

• antardasha: A × B / 120 years
• pratyantar: A × B × C / 120² years
• sookshma: A × B × C × D / 120³ years
• prana: A × B × C × D × E / 120⁴ years

The order rule does not change either. The nine sub-periods of any period start with the lord of that period and run on in the fixed cycle Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury, so the first sookshma inside a Saturn pratyantar is Saturn’s own and the last is the lord just before Saturn in the cycle, Jupiter. The antardasha tables already carry the third level for every pair; the fourth and fifth follow from it by the same step.

How Long Each Level Runs

The table enumerates every chain of lords at each level and reports the count, the shortest and the longest, on the 365.2425-day solar year. The shortest at each level is the Sun repeated, since six is the smallest share, and the longest is Venus repeated, since twenty is the largest.

So a sookshma dasha runs from about 6.6 hours (Sun inside Sun inside Sun inside Sun) to about 34 days (Venus four deep), averaging 6.7 days. A prana dasha runs from about 20 clock-minutes to 5.6 days, averaging about 18 hours. On the 360-day year of the texts the same figures come out slightly shorter, 6.5 hours and 33.3 days for the sookshma extremes; the proportion is identical and only the ruler differs.

Nine Sookshmas Inside One Pratyantar

To see the fourth level at a scale people actually look at, take the Saturn pratyantar of the Jupiter antardasha of the Rahu mahadasha. It lasts Rahu 18 × Jupiter 16 × Saturn 19 / 120² = 0.3800 years, about 139 days, and divides like this:

The nine add back to the pratyantar exactly. The longest of them, Venus’s, is 23.1 days, and the shortest, the Sun’s, is under a week. Each of these splits again by the same rule, so the Sun’s 6.9 days become nine prana dashas, the shortest of them the Sun’s own at 8.3 hours.

One Clock-Minute of Birth Time, in Days

Every Vimshottari date in a chart is counted from the Moon’s position at birth. If the recorded time is off, the Moon is off, the balance at birth is off, and every boundary at every level slides by the same amount. The dasha balance page measures that slide per hour, which is the right scale for mahadashas. For sookshma and prana the useful unit is a single minute of clock time.

Sampled once a day through 2026, the Moon’s sidereal motion ranged from 11.8° to 15.3° a day. How far one clock-minute moves every date depends on which lord’s nakshatra the Moon was in:

The smallest slide in the table, 1.35 days for a slow Moon in a Sun nakshatra, is already longer than the average prana dasha, and several times the shortest sookshma. The largest, 5.83 days for a fast Moon in a Venus nakshatra, is longer than the longest prana dasha there is. A birth time known only to the nearest five minutes therefore leaves every date uncertain across a window from about 7 days wide to about 29 days wide, which is the same order as a whole sookshma dasha.

The practical reading of the arithmetic is that these two levels are only as real as the birth minute behind them. A printed prana dasha date is exact as arithmetic and not as a fact about a life unless the birth was timed to the minute or better; the same is broadly true of sookshma. The kundli without birth time page sets out which parts of a chart survive an uncertain time, and the finer the dasha level, the less of it survives.

Why Two Calculators Disagree at This Level

Three settings that barely show at the mahadasha level decide the answer down here. The year length is one: on the solar year a 20-year Venus mahadasha is about 105 days longer than on the 360-day year, and every sookshma inside it is placed accordingly. The ayanamsa is another, since a different zodiac offset moves the Moon and so the balance. The third is the birth time as entered, including whether the program was told the time zone and any war-time or daylight-saving clock correction. When two printouts give sookshma dates a few days apart, one of these is the first thing to check, and neither program has made an error in the formula.

The site’s dasha calculator prints mahadashas and antardashas and goes no deeper, and the how to read your dasha guide covers the levels above the ones on this page. The system as a whole is set out in Vimshottari dasha explained.

What This Page Does Not Say

It gives no reading for any sookshma or prana lord and does not call any of these periods good or bad for anything. In Parashari practice a sub-period is read through the houses its lord rules and occupies in the birth chart, which a table of lengths does not contain. The page shows no current period, because that would depend on the day it was built, and it offers no method of correcting a birth time from events.