April 23, 2021: Bright Jupiter and Saturn are in the southeast before sunrise. Jupiter is the brightest “star” in the region. Saturn is to the Jovian Giant’s upper right.
by Jeffrey L. Hunt
Chicago, Illinois: Sunrise, 5:58 a.m. CDT; Sunset, 7:41 p.m. CDT. Check local sources for sunrise and sunset times for your location.
Morning planets Jupiter and Saturn are in the southeast before sunrise. Both planets are brighter than all the stars in the region. Jupiter is much brighter than Saturn.
Saturn is 19.0° up in the southeast, 1.3° to the upper right of the star Theta Capricorni (θ Cap on the chart).
Bright Jupiter is 14.4° to the lower left of Saturn. Your fist – from thumb knuckle to pinky finger – covers about 10° in the sky. The planets are easily seen when your arm is extended and held against the sky between the two worlds.
In the starfield, Jupiter is 3.8° to the upper left of Deneb Algiedi (δ Cap), 1.0° to the lower left of Mu Capricorni (μ Cap), and 2.2° to the upper right of Iota Aquarii (ι Aqr).
Use a binocular to track the motion of Jupiter against the three stars and compare it to Saturn’s eastward trek contrasted to Theta Capricorni.
Detailed Note: One hour before sunrise, Saturn is 19.0° up in the southeast, 1.3° to the upper right of Theta Capricorni (θ Cap). Jupiter is 14.4° to the lower left of the Ringed Wonder. In the starfield, Jupiter is 3.8° to the upper left of Dene Algiedi, 1.0° to the lower left of μ Cap and 2.2° to the upper right of ι Aqr. Twenty minutes after sunset, Venus is nearly 3° up in the west-northwest. Mercury (m = −1.8) – less than 2° in altitude – is 1.9° to the lower right of Venus. Find a clear horizon. As the sky darkens further, find Mars 39.0° up in the west, 1.8° to the right of 1 Geminorum (1 Gem, m = 4.2) and 4.1° to the lower right of Propus. Under bright moonlight use a binocular to spot the star cluster M35, 1.9° to the upper left of Mars. Farther eastward, the moon (12.0d, 87%) is nearly 50° up in the southeast. It is 7.5° to the lower right of Denebola (β Leo, m = 2.1).
Read more about the planets during April 2021.
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.
October 21-November 1, 2021: Brilliant Venus steps through Ophiuchus to the upper left of the star Antares in the southwest after sunset . Afterward, the planet steps farther eastward.
October 21, 2021: The bright moon is low in the west about an hour before sunrise. Mercury is in the east at about the same altitude as Arcturus. Venus, Saturn, and Jupiter shine from the evening sky.
December 18, 2021: This is the anticipated launch date of the James Webb Space Telescope, the largest and most sophisticated space telescope view the universe.