A stretch when a planet appears to move backwards against the stars, seen from Earth. Nothing actually reverses; the themes that planet carries tend to be revisited rather than advanced. The apparent reversal is a viewing angle — Earth overtaking a slower planet, or being overtaken by a faster one — but the degrees it re-crosses are real, and it crosses them three times in all.
A retrograde transit repeats itself. The planet perfects the same contact on the way forward, again while retrograde, and a third time after it turns direct, so a retrograde-period contact is rarely finished the first time it lands.
review, revision, and the return of something already begun.
Mercury retrograde square natal Saturn reads as the conversation you have to have twice before it settles.
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