1. Mercury is currently in retrograde.
(Or to be grammatically correct, Mercury is currently retrograde.)
2. That just means that it looks like it’s going backward in the sky from our vantage point.
This diagram shows how retrograde motion works. Mars, for example, orbits the sun slower than Earth. So when we overtake it, it looks like it’s changed direction. But in reality, it hasn’t.
Mercury is closer to the sun than Earth is, so its retrograde motion works in a slightly different way, but the principle is the same.
3. Each time Mercury is retrograde, it affects different star signs.
4. In 2013, the retrogrades are water signs.
In 2013, the retrograde hits Feb. 23 to March 17 in Pisces, June 26 to July 20 in Cancer, and Oct. 21 to Nov. 10 Scorpio.