This is from "A Textbook of Varshaphala " by Dr K S Charak.
The Mudda Dasha is a system which shows the planetary periods for one year from the exact time of a solar return chart (or Varshaphala) and is the equivalent of the Vimshottari Dasha periods for a natal chart, proportionally reduced from 120 years to one year or 360 days.
It is also based on the
's Nakshatra at the time of birth, and is calculated like this:
The first dasha is found by adding to the completed years...