Astronomy

2020, November 21: Evening Planets, First Quarter Moon

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2020, November 21: Saturn is over 23° in altitude in the south-southwest, 3.1° to the upper left of Jupiter. Among the dimmer stars, Saturn is 3.0° to the left of 56 Sagittarii (56 Sgr). Jupiter is 2.0° below that star and 3.6° to the upper left of 52 Sagittarii (52 Sgr).

November 21, 2020: The Great Conjunction countdown begins, 30 days until the conjunction.  Jupiter and Saturn are low in the south-southwest after sunset.  The moon appears between Mars and the approaching conjunction.  Mars is moving eastward among the stars of Pisces.  The moon is at its First Quarter phase at 10:45 p.m. CST.

by Jeffrey L. Hunt

Chicago, Illinois:  Sunrise, 6:48 a.m. CST; Sunset, 4:25 p.m. CST.  Check local sources for sunrise and sunset times for your location.

During the early evening, the thick crescent moon is in the southern sky in front of the dim stars of Aquarius.  As the countdown begins for the Great Conjunction of Jupiter and Saturn on December 21, 2020, Saturn is about one-fourth of the way up in the south-southwest, 3.1° to the upper left of brighter Jupiter.

Use a binocular to see up to four of Jupiter’s largest moons.  With the binocular note that the planets are dancing – nightly changing positions – with the star 56 Sagittarius (56 Sgr on the chart).  Saturn is 3.0° to the left of the star, while Jupiter is 2.0° below it.  Jupiter is also 3.6° to the upper left of 52 Sagittarii (52 Sgr).

2020, November 21: Mars is nearly 33° up in the east-southeast. It is 2.6° to the lower right of Epsilon Piscium (ε Psc) and 2.9° to the lower left of Delta Piscium (δ Psc).

Farther east, Mars is moving eastward among the stars of Pisces.  The Red Planet is over one-third of the way up in the east-southeast as the sky darkens after sunset.  It appears near the dim stars Epsilon Piscium (ε Psc on the chart) and Delta Piscium (δ Psc).

By 8:40 p.m. CST (over 4 hours after sunset), Mars is in the southern sky.  It sets in the west after 3 a.m. tomorrow morning.

The moon reaches its First Quarter phase at 10:45 p.m. CST.

For more about Mars during November, see this article.

Detailed note: One hour after sunset, the moon (6.8d, 48%) in western Aquarius – is over 30° up in the south, 4.6° to the lower left of δ Cap. Farther west, Saturn is over 23° in altitude in the south-southwest, 3.1° to the upper left of Jupiter. The Great Conjunction countdown begins, 30 days until the conjunction. Among the dimmer stars, Saturn is 3.0° to the left of 56 Sgr.  Jupiter is 2.0° below that star and 3.6° to the upper left of 52 Sgr.  Mars is nearly 33° up in the east-southeast.  It is 2.6° to the lower right of ε Psc and 2.9° to the lower left of δ Psc.  The moon reaches its First Quarter phase at 10:45 p.m. CST.

For more about the Great Conjunction, read our feature article. This is the closest Jupiter – Saturn conjunction since 1623.

Read more about the planets during November.

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