Jupiter Starts Retrograde Motion (Tuesday, Nov. 11 - late night) The eastward prograde motion of the planet Jupiter below Pollux, Gemini’s more southerly “twin” star, will temporarily cease. After Tuesday, Jupiter will accelerate into a westward retrograde loop that will last until mid-March and span 10 degrees of the ecliptic. You can easily observe Jupiter’s motion over the coming weeks by comparing its position to Pollux and the medium-bright star Wasat, which marks that twin’s waist. The ext