Brilliant Morning Star Venus shines from the east-southeast before sunrise. It is in front of the stars of Leo. In the evening, the lunar crescent is in the southwest, not far from Jupiter and Saturn that are approaching their Great Conjunction on December 21, 2020. Bright Mars shines from the evening’s eastern sky.
by Jeffrey L. Hunt
Chicago, Illinois: Sunrise, 7:09 a.m. CDT; Sunset, 6:01 p.m. CDT. Check local sources for sunrise and sunset times in different locations.
Morning: Morning Star Venus continues to gleam in the eastern sky before sunrise. It is over 11° to the lower right of Denebola – the Tail of Leo. When you extend your closed fist to arm’s length, then it should cover nearly all the space between the brilliant planet and the star. Use a binocular to see Venus among the dimmer stars. Bright Mars is very low in the west. Early next month, Venus rises as Mars sets, a Venus – Mars opposition. The planets are on opposite parts of the sky. What is the last date that you can see them together in the morning sky? The Red Planet returns to the eastern sky after sunset. See our detailed chart for Venus in October here.
Detailed morning note: One hour before sunrise, Venus is over 22° up in the east-southeast, moving eastward in Leo. Among the stars it is 1.9° below Sigma Leonis (σ Leo) and 2.0° to the upper left of Tau Leonis (τ Leo). Through a telescope, Venus is 13.9” in apparent diameter and 78% illuminated – a morning gibbous. Mars – about 4° up in the west – is 170.8° of ecliptic longitude west of Venus.
Evening: In the south-southwest about an hour after sunset, the crescent moon – 4.2 days after its New moon phase and 23% illuminated – is between Antares – the Heart of the Scorpion – and the Teapot of Sagittarius. The Teapot, along with the Big Dipper, Little Dipper, Sickle of Leo, and many other shapes, is an asterism. An asterismis group of stars that makes a familiar shape that is often part of a constellation. Kaus Borealis (λ Sgr) is the star at the top of the Teapot shape. Use a binocular for a clearer look. Jupiter and Saturn are farther to the left of the star. The planets are 6.0° apart. They are moving eastward compared to the starry background. During the next few weeks, watch Jupiter dramatically cut the distance to Saturn in a prelude to their Great Conjunction. Jupiter sets in the southwest at about 11 p.m. and Saturn follows about 30 minutes later. Bright Mars is in the east-southeast among the dim stars of Pisces. It is retrograding – moving westward compared to the starry background. This is an illusion from our planet passing Mars. Opposition was a week ago. The Red Planet is south near midnight and sets in the west before sunrise.
Detailed evening note: One hour after sunset the moon (4.2d, 23%) – nearly 16° up in the south-southwest – is above a line from Antares to Kaus Borealis (λ Sgr, m = 2.8), the star at the top of the lid of the Teapot of Sagittarius. The gaps: Moon – Kaus Borealis, 10.9°; Moon – Antares, 15.9°. Look carefully for Antares as it is only 6° in altitude in the southwest. Farther eastward, Jupiter is about 25° up in the south-southwest. The Jupiter – Saturn gap is 6.0°. In the starfield, Jupiter is 3.6° to the lower left of π Sgr and 0.8° to the lower right of 50 Sgr. Saturn is 1.8° to the lower left of 56 Sgr. At this hour, Mars is nearly 14° in altitude in the south-southeast, 89.3° of ecliptic longitude east of Jupiter. An hour later, the Red Planet is nearly 25° up in the east-southeast. It is left of a line from 80 Psc to 89 Psc. The planet is 1.2° to the lower left of 80 Psc and 1.8° above 89 Psc. Through a telescope, Mars is 21.8” across.
Read more about the planets during October.
Mars and Morning Star Venus are nearing their opposition so that they do not appear together in the morning sky for the remainder of 2020. In the evening sky, three planets – Mars, Jupiter, and Saturn – along with the moon, are easy to locate.
Bright Mars is visible in the western sky before sunrise. Brilliant Venus makes its last appearance in Leo for this morning apparition. In the evening sky, the crescent moon is near Jupiter and Saturn, while bright Mars begins the night in the east-southeast.
Morning Star Venus and Mars are approaching the date when they do not appear in the morning sky again for the remainder of the year. The lunar crescent appears among the stars of Sagittarius, near giant planets Jupiter and Saturn as they approach their Great Conjunction on December 21, 2020.