Hayanaratna 2.157

Now the strength of the planets by day and so on. There, take the Sun away from the lagna (rising sign). If the remainder is less than three signs, multiply its signs and so on by twenty. That is the strength. If it is more, take it away from six. Multiply the remainder, in signs and so on, by twenty. That is the strength of male planets. When the lagna less the Sun is more than six signs, male planets have no strength. In the same way, when it is less than six, female planets have no strength. When it is more than six, take six away. Or, if it is more than nine, take it away from twelve. The remainder multiplied by twenty is the strength of female planets. This is because males are said to be strong by day, and females by night. At the junction, however, there is a stop.

Simple meaning: Day and night strength: take the Sun from the lagna. Male planets rise to 60 at 3 signs and are nil at 0 and 6. Female planets rise to 60 at 9 signs and are nil at 6 and 12.