Sun is planet which moves at the rate of 3 days 8 hrs in one Navamsa i.e 13 days 8 hrs in 1 Nakshatra,
where as moon takes on 1 day to complete one Nakshatra
When we considering from the Sun their is other planet movements create a disturbances (Argala), which is why predicted things are not happens as per the predictions.
Prediction will be accurate when we considering from Moon.
which is very easy to compare the running dasa to judge the prediction .
i.e why all Gurubala, Shanibala, Tarabala, Chandrabala is considering from the MOON.
Moon will under go different avasta's in 1 Star which helps the prediction to be accurate.