At the time of commencement of a dasa, if there be benefics in the 1st, 4th, 7th, 10th, 5th, 9th and 8th, favourable effects will be experienced in the concerned year, month etc. The house which is occupied by only Rāhu or Ketu becomes harmful. The same will be the fate of the house which is occupied by a larger number of malefics. If there be benefics in houses other than the 12th or 6th, the house concerned will produce favourable effects. In other words, if the benefics be in the 12th or 6th from the house concerned, unfavourable effects will be derived in the related year, month etc. If there be malefics in the 3rd, 6th and 11th from the house assuming the role of the Ascendant, then these three houses will produce auspicious results. The effects can be ascertained for every year, month etc. in this manner. The total number of years in Vimśottarī Dasa are 120 years. After every 12 years the same method of determining the dasas, antardasas etc. has to be repeated for the Ascendant and other houses.

पापा वा यत्र बहवस्तत्तद्भावविनाशनम्‌ । विरिःफारि शुभैः पापिस्त्रिषडायस्थितः शुभम्‌ । ।26।। जिस भाव में बहुत से पाप ग्रह हों उस भाव की भी हानि होती है । 3, 6, 11 भाव में शुभ ग्रह होने से उस वर्ष-मासादि में कष्ट; तथा इनसे अतिरिक्त केन्द्र, कोण या अष्टमादि में शुभ ग्रह होने से शुभ होता है ।