Mercury stations retrograde on September 30, 1909 at 27° Libra, and direct on October 21 at 12° Libra — 21 days. From the Earth, Mercury seems to back up against the stars as we overtake it, as a car passed on the highway seems to slide backward. Astrology holds it a time for crossed wires and delays. Computed from JPL's approximate orbits; the stations agree with an almanac's to within minutes.