Hayanaratna 2.142

Here the multiplier is three times the divisor. So 'degrees and so on, made three times' is proved. In the same way, work out the strength of a great friend's and other drekkana (one-third part of a sign). Work out the planet's hadda (a planet's own small part of a sign), drekkana and musallaha (its own one-ninth part of a sign) strength too, by the greatest strength told before. In the same way, take own and other navamsha (one-ninth part of a sign), and own and other hadda. The result is known by proportion with their degrees. There, the greatest strength in hadda is 15 kala (one-sixtieth part). In musallaha it is 5 kala. Then take the sum of all the strengths. Multiply it by the sum of the drishti (a planet's look) that other planets have cast on that planet. Divide by sixty. It becomes exact.

Simple meaning: Place strength: add all the strengths, multiply by the sum of the aspects from other planets, and divide by 60.