December 22, 2020: Jupiter inches away from Saturn as the gap between the planets grows slightly. The gibbous moon and Red Planet Mars are on the southeast after sunset.
by Jeffrey L. Hunt
Chicago, Illinois: Sunrise, 7:16 a.m. CST; Sunset, 4:24 p.m. CST. Check local sources for sunrise and sunset times for your location.
As the sky darkens, Jupiter and Saturn are still close together in the southwest. Jupiter is to the upper left of Saturn. The gap is slightly larger than last night. On following nights, the gap continues to grow. The two planets will not be this close together again until 2080 – three great conjunctions away.
You can see the planets easily in the southwest from about 45 minutes after sunset until about 90 minutes after sunset. They set in the west over 2 hours after the sun disappears below the horizon.
Farther eastward, the bright gibbous moon is to the lower right of Mars in the southeast. The moon is over 60% illuminated.
Mars continues its eastward march in Pisces. Use a binocular to find it about midway between Zeta Piscium (ζ Psc on the chart) and dim Pi Piscium (π Psc).
Mars is in the south about 3 hours after sunset. It sets in the west over 5 hours before sunrise.
Read about Mars during December.
Detailed note: Forty-five minutes after sunset, Jupiter and Saturn are less than 14° in altitude above the southwest horizon. The Jupiter – Saturn gap is 0.1° (602 arcseconds.) Jupiter is to the left of Saturn. As the sky darkens further, the bright gibbous moon (8.3d, 60%) – about halfway up in the sky in the southeast is nearly 13° to the lower right of Mars. Use a binocular to spot the starfield behind Mars. The planet is nearly midway from ζ Psc to π Psc, but slightly below a line that connects them. Mars is 3.6° to the left of ζ Psc and 3.7° to the lower right of π Psc.
Read more about the planets during December.
October 26, 2021: Mercury is at its greatest morning appearance for the year. Look low in the east-southeast before sunrise.
October 25, 2021: This morning the bright gibbous moon seems to be caught between the horns of Taurus. Mercury is making its best morning appearance. The planet pack – Venus, Jupiter, and Saturn are in the evening sky.
October 24, 2021: Saturn is at its closest to Jupiter as the Jovian Giant picks up eastward speed. The morning moon and Mercury are visible before sunrise. Brilliant Evening Star Venus, Saturn, and Jupiter are in the sky after sunset.
October 23, 2021: This morning the bright moon is near the Pleiades star cluster. Mercury is making its best morning appearance. In the evening sky, Venus, Jupiter and Saturn are easy to spot.
October 22. 2021: Speedy Mercury is low in the east before sunrise. It is putting on its best morning performance of the year. Arcturus, in the east-northeast, is about the same altitude as Mercury.