Hayanaratna 2.147

Now for a planet at the same point as the lagna (rising sign): the strength is full. From the vikala (one-sixtieth of a minute) at the end-point of the 12th junction, the lagna house begins. From there up to its end-point, the result grows. Take the vikala at the end-point of the 1st house, up to the end-point of the 1st junction. There the house result grows. For a planet standing in between, there is proportion. That proportion was already made to find the house result. It was made by the words beginning 'first the gap between the planet and the junction is to be made'. So for a planet in the lagna, the house result itself is the strength. For a planet in a kendra (corner house), half the house result is the strength. For a planet in panaphara (succeeding house) or apoklima (falling house), a quarter of the house result is the strength.

Simple meaning: Place strength by the house result: lagna planet gets the whole house result, a corner house planet half, the other houses a quarter.