Timing of events has been a hard nut to crack in Astrology. Out of the different methods prevalent Vimshottari Dasa System is the most reliable one if understood and used properly keeping in mind its principles. The author has made an attempt to enlighten the readers with this most widely used Dasa system of Maharshi Parasara. Principles of Sudarsana is used citing a few examples. Examples of day to day life are an addendum to the utility of the work. Quotations from ancient classics and transit applications add laurels to the book. The scientific base of Vimshottari Dasa has been discussed analytically. Enough number of Charts have been discussed in the light of the principles of Vimshottari Dasa. The author has tried to eradicate the doubts about Vimshottari Dasa system in a systematic and scientific way.