... Jupiter rules the sky in this labeled view of a starry September night from the Alborz mountains in Iran, complete with the trail of a red flashlight illuminating the mountain road. On September 21st ( Universal Time ) Jupiter will be at opposition, the point opposite the Sun along its orbit, rising just as the Sun sets. ... Remarkably close to the opposition of both planets, the point on the sky exactly opposite the Sun on September 23rd is marked the Vernal Equinox . ... Two Planet Opposition . ...