Mercury, like Venus has a shorter orbit than Earth; in the case of Mercury, very much shorter. Mercury completes three orbits in just under 50 weeks, so that there are six conjunctions three inferior and three superior in each year. If all six are marked on the circle of the zodiac and the three inferior joined by lines drawn 1-2-3-1 and the three superior joined 1-2-3-1. The result is a hexagram the Star of David or Seal of Solomon.
The information…came from: Movement and Rhythms of the Stars; SCHULTZ, Joachim (translated by John Meeks);