When Saturn enters the 12th house from natal moon and when it passes through the 12th house, the house of Moon and the house next to moon that seven and half year ( 7 and half years ) is termed as Sade Sati of Shani or Saturn.
Most of the Vedic Astrologers are of the opinion that this period in a person’s life would bring about untold sufferings and misfortune. But in reality it has been observed that Sade Sati period can bring prosperity and success to an individual. It is necessary to judge the Sade Sati period case to case basics before coming to a conclusion that the entire seven and a half period is bad. Now I am going to explain the reason behind it with an example based on the principles of KP ( Vedic ) Astrology.
I will take the case of Aries Ascendant or Mesha Lagna with Moon positioned in Aries (Mesha) In the case of Mesha Rasi when Saturn enters Pisces then the Sade Sati period starts for such native. In Pisces there are three nakshatras namely Poorvabhadrapada (Ruled by Jupiter), Uttarabhadrapada (Ruled by Saturn) and Revathi (Ruled by Mercury).
The zone of Poorvabhadrapada is till 3 degree 20 minutes in Pisces, the next nakshatra Uttarabhadrapada is till 16 degree 40 minutes in Pisces and Revathi covering the remaining part of Pisces. Now let us consider the case of Saturn and Mercury here. Saturn is the lord of 10th and 11th house for Aries Ascendant or Mesha Lagna. So when Saturn passes through the zone of Uttarabhadrapada it has been observed that during that time there is prosperity and success achieved by the people born with Mesha Lagna and Mesha Rashi.
Now taking the case of Mercury who happens to be the lord of 3rd and 6th house for them, during the time when Saturn passes through the zone of Revathi nakshatra they can gain in competition. So we can conclude that it not necessary that Sade Sati would bring disaster and suffering in a person life. On the contrary it can bring huge success when Saturn passes through a friendly nakshatra with respect to the Ascendant if Saturn in the horoscope is not signifying evil houses. So it is necessary to customize the prediction of Sade Sati based on Lagna, Rashi and Saturn himself (whether it is good or bad for the horoscope).
I would conclude the article with this note that don’t jump into conclusion that Sade Sati period of your life would be bad. Any comments or questions are appreciated.