2021: The Morning Sky
by Jeffrey L. Hunt
During 2021 the morning sky has limited planetary activity. Early in the year, Venus disappears into the sun’s bright twilight. It does not appear in the morning sky for the remainder of the year. After their great conjunction, Saturn and Jupiter return to the morning sky after their conjunctions with the sun. Mercury makes three morning appearances. The best occurs with the speedy planet rises at the beginning of morning twilight during late October. The moon makes monthly passes through the morning sky. As the year ends, Mars becomes visible in the eastern sky before sunrise.
- During February Venus passes Saturn and Jupiter in difficult-to see conjunctions.
- March 9: Look for the moon, Jupiter and Saturn.
- July 8: The moon, Mercury, and Zeta Tauri are near each other.
- October 3: The moon passes Regulus.
- November 3: The moon, Mercury and Spica are grouped together.
- November 10: Mercury and Mars appear close together.
The chart above shows rising of the naked-eye planets, moon, and bright stars near the ecliptic for 2021. The graphs display the rising of these celestial bodies compared to sunrise and sunset for time intervals up to five hours before the sun’s appearance. The three phases of twilight are displayed as well. On the rising chart, activity occurs in the eastern sky, except for the setting curves (circles) of Jupiter and Saturn.
It should be noted that when two objects rise at the same time intervals after sunset (same clock time), they are not necessarily near each other. It merely means that they rise or set at the same time interval after sunset or rise at the same time interval before sunrise. Since the charts feature objects’ activities near the ecliptic, they are likely to be up to 10° apart. For example, on the morning of March 9, 2021, the moon and Saturn rise at nearly the same time interval, 100 minutes before sunrise. The moon rising circle nearly coincides with the Saturn rising line. The waning crescent moon, though is 7.8° to the right of the Ringed Wonder that morning
The charts are calculated from data by the U.S. Naval Observatory, for Chicago, Illinois.
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.