Sade sati is a period that occurs when Saturn Transit from one sign to another sign. Saturn is the slowest moving planet, and it takes around 2.5 years to complete a transit in one sign. It means each sign will face the impact of Shani Sade Sati for at-least 2.5 years. According to Dr. Vinay Bajrangi, sade sati begins when Saturn enters the 12th sign from the natal moon, and it ends with the exit of this planet from the second sign from the natal moon chart.