The transit of Saturn in the zodiac sign 12th 1st and 2nd from the house in which planet Moon is located at the time of your birth is known as Saade Sati of Saturn. The Saade Sati of Saturn has three phases: The transit of Saturn into the twelfth house from the moon sign is called the first phase. The transit into the moon sign is the second phase. The transit into the second sign from the moon sign is the third phase. As Saturn remains for two and half years in each phase that is why it is called Saade Sati (7 ½). The seven and half years are never always unlucky only. The favorableness and un-favorableness of Saturn depend upon its relations (friendly/enemy/neutral) with the ruler of that particular house and according to the ownership of Saturn in the house of the birth sign.