Principles for Calculation of progression
Rule 1
Once the major period of planet begins the concerned planet would travel over
all the twelve houses
Starting from its position in the sign at the time of birth through progression.
Suppose the planet is at 10 degree in Libra in the birth chart. It would start
progressing from 10 degree Libra. The planet Progress to Scorpio, Sagittarius,
Capricorn, etc till it enters Libra at O degree and reaches 10 degree in the sign
again.
The major Vimshottari period shall come to an end when the planet through
progression has returned to its natal Position respectively.