About three times a year, Mercury goes retrograde for approximately three weeks. First, let’s get the techie stuff out of the way. When a planet is retrograde, from our visual point of view, it appears to be moving backwards through the zodiac. First it slows down, then it stops, which is called a “station.” Then it proceeds to move backwards until it slows down, makes another station and moves forward again. I think we feel the effect of the stations for about one degree of the zodiac before and one degree after the exact station. Planets don’t actually reverse direction in their orbits. They appear to do so because the Earth has temporarily passed them in its own orbit.