Interpretation
Interpretation of transits is usually fairly similar to the interpretation of progressions. In general however, transits primarily involve developments in the life circumstances outside the individual's control, while progressions involve psychological developments from within the individual.
The most important point to remember with transits is that the pattern of the natal chart always determines their value. So, for example if the sun and Jupiter are in a difficult aspect in the natal chart, a positive or easy aspect between transiting Jupiter and the natal sun will not produce the same expected benefit. Also, if planets are not aspected in the natal chart, transiting 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.
Transits of the personal planets – Sun, Moon, Mercury, Venus and Mars – are usually not considered as important because they move so quickly through the zodiac. The transits of the slower moving planets - Jupiter, Saturn, Uranus, Neptune, and Pluto – are more powerful and noticeable, especially when they hit a personal planet or cardinal point.
Read more about this topic: Astrological Transit