Saadhe – Sati means – Seven and a half year period when transiting Saturn is in the 12th House From one’s radical moon. For two and a half – years.
For Example if Someone’s Moon is in Leo sign – his saadhe – sati began when Safurn entered Cancer Sign.
For two and half year 2nd phase will start when Saturn entered in Leo Sign.
3rd Phase will start when Saturn entered in Virgo Sign.