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.
7. So awry.
Mercury in retrograde and you better believe my shoes leaked
8. Some people might not understand.
Mercury is in retrograde which means for three weeks I obnoxiously explain that Mercury is in retrograde.