## How to Calculate Dasha and Antardasha in Vedic Astrology

1. In this chapter is explained the method of calculating the antar dasa and

pratyantar dasa. There are antar dasas of all the nine planets in a dasa. For

example, in the dasa of the Sun there will be the antar dasas of the Sun and all the

other planets. The first antar dasa is of the same planet who is the lord of the dasa.

For example, in the dasa of Jupiter the order of antar dasas will be Jupiter, Saturn,

Mercury, Ketu, Venus, the Sun, the Moon, Mars and Rahu. In the dasa of Venus the

order of antar dasa will be venus, the Sun, the Moon, Mars, Rahu, Jupiter, Saturn,

Mercury and Ketu.

As there are nine antar dasas in a dasa, there are nine pratyantar dasas in an

antar dasa. The first pratyantar dasa will be of the lord of antar dasa.

Whatever has been here described as effects of any planet, all this should

occur in the planet’s dasa, in his antar dasa and in his pratyantar dasa.

2. The period of antar dasa in a dasa should be calculated by the rule of

three. Suppose if we have to know the duration of antar dasa of the Sun in the dasa

of Venus we should proceed as explained below. In 120 years the Sun’s portion is

of 6years. In 1 year the Sun’s portion will be (6/120)*1. Therefore, in 20 years the

Sun will have Antar Dasa of (6*1/120)*20 = 1 year.

The Sun’s dasa is of 6 years and the dasa of Venus is of 20 years. Therefore

the figures of 20 and 6 have been taken above. The pratyantar dasa in any case can

also be calculated in the same manner. We have found out that in the dasa of Venus

the duration of Sun’s an tar dasa is 1 year. Now let us find out how much will be

the duration of pratyantar dasa of the Sun in his antar dasas.

In 120 years the duration is 6 years

In 1 year it will be (6*1/120) = 1/20 years

(1/20)*360 days = 18 days.

Thus in the dasa of Venus, the duration of the pratyantar dasa of the Sun in

his antar dasa will be 18 days.

These informations are available in readymade tables in the various

Panchangas which can be usefully utilised.

Notes — Shri V. Subrahmaniam Sastry has explained the method of

calculation as under :—

“Multiply the years of maha dasa by the years of the planet whose antar dasa

is required. Divide the period by 120. The quotient will represent the years of antar

dasa. Multiply the remainder by 12 and divide the result by 120. The quotient will

represent the months, multiply the remainder by 30 and divide by 120. The

quotient will give the days and so on. The same process should be adopted for

calculating the sub-divisions. In any dasa the order of the antar dasa is similar to

that in the dasa of the first antar dasa commencing with that of its lord.”

There is an easy method by mean of which the antar dasa can be

independently calculated. This may be helpful at times when the antar dasa tables

are not readily available.

Multiply the number of years of dasa period of the planet by the number of

years of dasa of the period of the planet antar dasa is required. The last figure in

the product always represents the decimal of a month and the rest represents the

total number of months. Then cutting of the last digit of the product, multiuply it

by 3 and keep that figure as days. Suppose we want to find out the antar dasa of

Mercury in the dasa of Saturn. Multiply the dasa period of Mercury 17 years by

that of Saturn viz. 19 years i.e. 19*17 = 323. By adopting the above method the

antar dasa of Mercury will be 32 months and 9 days i.e. 2 years 8 months 9 days.