During the next week Jupiter approaches and passes Saturn for their once-in-a-generation Great Conjunction on December 21, 2020.
On December 15, the razor-thin appears to the lower right of Jupiter and Saturn after sunset. The planets are 0.6° apart.
A little later as the sky darkens further and the moon sets, the planets are visible together low in the southwest.
Just 5 days before the conjunction the crescent moon shines beneath the converging planets. The planet gap is 0.5°, the apparent diameter of the moon in the sky. For the next several evenings, your pinky finger at arms length covers both planets.
December 17, the crescent moon appears to the upper left of the converging planets. The planets are 0.4° apart.
The moon is to the upper left of the planets. The gap between Jupiter and Saturn is 0.3°.
The waxing gibbous moon is to the upper left of the impending conjunction. Bright Jupiter is 0.2° to the lower right of Saturn.
One night before the conjunction, Jupiter is below Saturn.
Jupiter passes Saturn during daylight hours in North America and South America when they share the same celestial longitude – the definition of a conjunction. By nightfall the planets are still close in the southwest after sunset.
Conjunction evening! Jupiter is immediately to the lower left of Saturn.
Through a small telescope or spotting scope, both planets appear in the same field of view. Jupiter’s four largest moons and Saturn’s moons are easy to see.
A binocular may reveal some of the Jovian moons.
The planets are visible as separate “stars” to the unaided eye. They do not merge into a single point or suddenly brighten.
During the next week, watch the Jupiter move away from Saturn.
October 9, 2021: Look for brilliant Venus, crescent moon, and the head of Scorpius in the southwest after sunset. About every eight years, Venus and the moon appear near the head of the Scorpion after sunset. Look for them about 45 minutes after sunset.
October 1, 2021: Before sunrise, the lunar crescent is near the Beehive star cluster.
Newly released analysis from the Mars Reconnaissance Orbiter shows that the Arabia Terra region on Mars experienced powerful volcanic eruptions.
September 30, 2021: An hour before sunrise, the crescent moon is near the Gemini Twins.
September 29, 2021: The thick crescent moon is in the southeast before sunrise, approaching the middle of Gemini. The evening planet pack is visible after sunset.