Shani Sade Sati or simply Sade Sati is a period in the life of an individual, spanning approximately seven and a half years, which is dubiously associated with difficulties and challenges. Sade Sati starts with the entry of planet Saturn or Shani in the zodiac sign immediately before the janma rasi (zodiac sign of moon as per native's birth chart). The period ends with the exit of Shani from the zodiac sign immediately following the zodiac of moon. Shani takes two and a half years to transit each zodiac and therefore takes a total of seven and a half years to exit the third zodiac.
Sade Satti is a very dreadful word for the common masses. When, Saturn transits through the 12th, 1st, and 2nd house from the natal moon (where one's Moon is placed in the birth chart), this is termed Sade satti. Saturn takes 2 and half years to pass through each sign (30 years to make one round of the zodiac), its passing through 3 signs make it 7 and half years. Sade means "half" and Satti translates to "seven" and hence the name Sade Satti. There is a general belief that Sade Satti period brings dissatisfaction, disappointments, depression, differences, disputes, disharmony and undesirable results ,but actually this is not the case. Saturn does not always behave this way and it really depends on individual's chart. For example if Saturn is acting as a yoga karaka, there is no way it can cause all that problems in native's life. Most of the people go through 2-3 periods of Sade Satti in their life time, 4 periods are very rare. It reappears after every 25 years from when it first finished.
While it is true that during this 7-1/2 years Saturn transit period people do experience some tensions and troubles, it is nothing to be scared about. Even while giving some troubles and tensions, it does not deny you success. As a matter of fact a number of people prosper to new heights during this period. Sade satti is about doing one's obligatory duties without considering likes and dislikes. One who does this forever is least effected by Sade Satti and in fact gains during this period. However if anyone is arrogant, egoistic, unsympathetic, and non-hard working then he is targeted during the person's Sade Satti and can make him go through a lot of hardships.
First cycle of Sade-sati generally affects close relatives more than the native. The 2nd cycle influences the domestic front as well as the business front, and the 3rd cycle affects children, family, health, and physical suffering or may even indicate the death of the native. However before coming to any conclusion an astrologer must the following things.
Remedies should not be applied without taking into consideration how exactly the Sade Satti is going to affect you. If Saturn is trying to correct some of the wrong doings of your life e.g. trying to make you work very hard by creating obstacles, then it should probably be left untouched as its doing it for your own betterment. However if you feel that your life is really going through hell, you must consult a competent astrologer before applying any remedy. Daily reciting of Hanuman Chalisa can be done without any problem as it helps the native in all cases. Similarly wearing an Iron ring made out of horse shoe in your middle finger of right hand, offering copper and sesame oil to Saturn every Saturday are other harmless activities. Wearing any stone during this period is an absolute No No, unless the astrologer has really done his analysis (You can ask him the questions I explained earlier).
Saturn, which according to Hindu mythology is the son of Sun God, is not always a bad planet. Proper care must be given to complete analysis of this planet before concluding that Sade Satti can cause problems in one's life.