In fact all the planets act in tandem as Mahadasa/Antardasa/Pratyanthardasa/Sookshmadasa/Dehadasa and Pranadasa thus having a combined influence on every living being which goes on changing for each breath and that is why we are always in different moods throughout the day. That is why the net resultant strength of all planets is what counts in one’s life. Read my article “Day to day predictions in astrology” on my blog and you will get more details. Transitory influences of planets is another totally different exercise of evaluating the horoscope at the current positions of planets with respect to the natal Lagna longitude. There is also Narayanadasa or RasiDasa which is evaluated by the strength of each houses in a hierarchical order similar to Nakshatradasa.