When all the planets are between Rahu and Ketu, Kalsarpa is formed. When all the planets are in the centre of Rahu and Ketu, i.e. in the north and south nodes of the Moon, then Kalsarpa Yog is formed. Full Kalsarpa Yog takes place only when half of the house is emptied by the planets. Kalsarpa Yog is a terrible yog that can ruin a person's life. The person suffering from this yog lives a miserable life. If he is having serious problems, this yog can erase all the good yog from the table.