Principles for Calculation of progression
Rule 2
A planet that is in direct motion in the birth chart shall always progress
(Forward motion). Such a
Planet should move from a sign to the next sign. If for example, it is in Cancer it
should move to Leo, Virgo, Libra etc.
A planet that is retrograde in the birth chart shall always regress (Backward
motion). Such a planet if in Cancer should move to Gemini, Taurus, Aries etc.
The Sun and Moon shall invariably progress. Rahu and Ketu shall invariably
regress.