Interpretation
Interpretation of progressions is usually fairly similar to the interpretation of transits . In general however, progressions primarily involve psychological developments from within the individual (often of course stimulated by exterior events), while transits involve developments in the life circumstances outside the individual's control.
The most important point to remember with progressions is that the pattern of the natal chart always determines their value. So, for example if the sun and Mars are in a difficult aspect in the natal chart, a positive or easy aspect between progressed Mars and the natal sun will not produce the same expected benefit. Also, if planets are not aspected in the natal chart, progressed aspects will in general not have the same effect. In short each person carries the pattern of the natal chart with them all their lives, and the progressed and transiting movements of the planets indicate when the potential in the natal chart will be given opportunities for development.
Progressions are usually only important for the inner personal planets (Sun, Moon, Mercury, Venus, and Mars) as the progressed outer planets will have moved only an insignificant distance. However, the personal planets do make aspects to the transpersonal and outer planets. Significant events in the motion of a slow moving body, such as a station retrograde or direct by progression, are also considered significant by many astrologers who use progressions.
Read more about this topic: Astrological Progression