The method for obtaining the duration of an antar dasa is explained now. Note the number of years allotted to a planet whose major dasa is running. Multiply it by the number of years given to a planet whose sub-period is required. Multiply the number in the place of the units - by three. The result is the number of days. The numbers in tens and hundreds give the months of the antardasa. ‘Thus we get the durations of each sub-period in a major period. Convert the duration of the antardasa in days. Multiply it by the number of years given to the planet concerned. Divide the product by 120. The result is the duration of the sub-sub period (Vidasa) of the planet in the antardasa of another. The remainder is to be converted into ghatikas and Vighatikas. Still a sub-pcriod of this sub-sub-period can be obtained. This is the sukshma Dasa of a planet. The numbers arrived at will be the duration of the sukshma dasa in days, ghatikas and Vighatikas.