In the morning sky brilliant Morning Star Venus waltzes through Libra near Zubenelgenubi in the east-southeast. Venus is “that bright star” in the eastern sky before sunrise. The bright gibbous moon shines near the Gemini Twins in the western sky. In the evening sky, Mars – in the east-southeast – marches through Pisces. Jupiter closes the gap on Saturn as a prelude dance to the Great Conjunction, 17 evenings away.
by Jeffrey L. Hunt
Chicago, Illinois: Sunrise, 7:02 a.m. CST; Sunset, 4:20 p.m. CST. Check local sources for sunrise and sunset times in your location. Add the time intervals in the notes to your local sunrise or sunset times.
Morning: The bright gibbous moon is high in the west-southwest about an hour before sunrise. Its reflected sunlight easily casts shadows on the ground. Stand outside for a few moments and as your eyes adjust, you’ll see your own shadow from the moon as well as the shadows of your surroundings. Look carefully and you’ll see the Gemini Twins, Pollux and Castor, to the moon’s lower right. You may have to block out the moon’s glare. Simply use your hand as you would with the sun during a bright day. Farther east, brilliant Venus blazes from low in the east-southeast. It is 1.4° to the left of Zubenelgenubi. Use a binocular to see the planet 1.6° to the lower left of Mu Librae (μ Lib on the chart).
Venus is getting lower each day at this time interval. If you wait a little longer, Venus is higher in the sky. The stars will be more difficult to see. A binocular is necessary to see them as twilight proceeds.
Morning detailed note: One hour before sunrise, the moon (19.3d, 85%) is 49.0° above the west-southwest horizon. It is 6.7° to the upper left of Pollux. Farther east, brilliant Venus is 12.0° up in the east-southeast, 1.4° to the left of Zubenelgenubi and 1.6° to the lower left of μ Lib.
Evening: In the evening, Mars continues marching eastward among the stars of Pisces. While dimmer than about two months ago when it was closest to Earth, it is the brightest “star” in the east. Use a binocular to notice that the planet is between Epsilon Piscium (ε Psc on the chart) and 80 Psc. When Zeta Piscium (ζ Psc) is added, the stars make a small nearly equilateral triangle. Make nightly observations to spot Mars changing its position in that triangle.
Read about Mars during December.
One hour after sunset, Jupiter and Saturn are low in the west-southwest. They are in eastern Sagittarius. Jupiter is overtaking Saturn as the Great Conjunction of December 21, 2020 approaches. Their separation this evening is 1.8° In the starfield a binocular is needed to watch the slow dance that the planets make with the stars and each other. This evening Jupiter is 2.5° to the left of 56 Sagittarii (56 Sgr on the chart). Jupiter is 2.5° to the left of 56 Sgr while Saturn is 3.9° to its upper left. Saturn is beginning to approach Sigma Capricorni (σ Cap).
Evening detailed note: One hour after sunset, Mars is over 41° up in the east-southeast, between ε Psc and 80 Psc. The Red Planet is 1.0° to the lower right of ε Psc and 1.6° to the upper right of 80 Psc. Farther west, Jupiter is over 18° above the southwest horizon. The Jupiter – Saturn gap is 1.8°. Dimmer Saturn is to bright Jupiter’s upper left. Great Conjunction Countdown: 17 days. Among the stars, Jupiter is 2.5° to the left of 56 Sgr, while Saturn is 3.9° to the star’s upper left. Additionally, Saturn is 4.2° to the lower right of σ Cap. Six hours after sunset (10:20 p.m. CST), the moon (20.0d, 79%) is over 19° in altitude in the east. It is in front of the dim stars of Cancer.
Here is more about the planets during December 2020.
April 25, 2021: Mercury passes Evening Star Venus this evening after sunset. Look low in the western sky about 20 minutes after sunset. Mars is marching eastward in Gemini, near the star cluster Messier 35. The bright moon is near Spica.
April 25, 2021: Morning planets Jupiter and Saturn are in the southeast before sunrise. Jupiter is in front of the stars of Aquarius, while Saturn’s starry background is Capricornus.
April 24, 2021: Brilliant Evening Star Venus and bright Mercury are entering the evening sky. They are low in the west-northwest during evening twilight. The bright moon is in the southeast in Virgo. Mars moves into Gemini as it approaches the star cluster Messier 35.
April 24, 2021: The bright gibbous moon is near a star in Virgo during the early morning. From parts of the Western Hemisphere, the moon covers the star. Before sunrise, bright morning planets, Jupiter and Saturn are in the southeast before sunrise.
April 23, 2021: Evening Star Venus and Mercury are entering the evening sky. They are found very low in the west-northwest after sunset. The bright moon is in the southeastern sky during the early evening. Mars is moving toward the star cluster Messier 35.