Vimshottari dasa, Antar Dasa, Pratyantar dasa and its calculation is explained in detail in this video. It is called as Dasa Bhukti and Antar in South India and is also called as Main Period sub period and sub sub period. Normally it is taught this way to foreigners. Umang Taneja (www.nadi-astrology.com) umangtaneja@hotmail.com