2020, December 15: Moon Approaches Jupiter, Saturn

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2020, December 15: The razor-thin crescent moon appears very low in the southwest after sunset.

December 15, 2020:  This evening the moon begins its evening appearance for December low in the southwest after sunset, to the lower right of bright Jupiter.  The gap between Jupiter and Saturn continues to close.  Meanwhile, Rusty Mars is in the southeast marching eastward in front of the starry background of Pisces.

by Jeffrey L. Hunt

Chicago, Illinois:  Sunrise, 7:12 a.m. CST; Sunset, 4:21 p.m. CST.  Check local sources for sunrise and sunset times for your location.

The crescent moon begins its evening appearance low in the southwest, as the sky darkens.  You’ll need a clear view to the horizon toward the southwest.  A binocular will help you find the crescent that is only 2% illuminated.

At this hour, Jupiter is to the upper left of the lunar slice.  You may have to look carefully to find it.  Saturn is not likely visible, yet, without some help from a binocular.

Tomorrow the moon is closer to the impending conjunction in a little darker sky.

2020, December 15: In the southwest as night falls, Jupiter is 0.6° to the lower right of Saturn.

By 30 minutes later (an hour after sunset), Jupiter and Saturn are clearly visible.  Jupiter is 0.6° to the lower right of Saturn.  This separation is slightly larger than the apparent size of the full moon. Great Conjunction Countdown: 6 days. 

The best views of the planet pair occur from 45 minutes after sunset to about 2 hours after sunset.  By about three hours after sunset, the planets have set in the southwest.

2020, December 15: In the southeast after sunset, bright Mars is 1.2° to the upper left of Zeta Piscium (ζ Psc) and 3.4° to the lower left of Epsilon Piscium (ε Psc).

Bright, rusty Mars is about halfway up in the southeast about an hour after sunset. It continues to march eastward in front of the dim stars of Pisces.  With a binocular note that Mars is 1.2° to the upper left of Zeta Piscium (ζ Psc on the chart) and 3.4° to the lower left of Epsilon Piscium (ε Psc).  During the month, the planet moves in a direction between Pi Piscium (π Psc) and Omicron Piscium (ο Psc).

Mars then moves into Aries and moves far below Hamal next month.

Read about Mars during December.

Detailed note: Thirty minutes after sunset, the moon (1.3d, 2%) is about 6° up in the southwest – over 18° to the right of Jupiter.  Half an hour later, Saturn is 15° up in the southwest 0.6° to the upper left of bright Jupiter.  Today, Saturn moved into Capricornus from Sagittarius. Great Conjunction Countdown: 6 days. Mars is 81.9° of ecliptic longitude east of Jupiter, over 46° in altitude above the southeast horizon.  In the starfield, the planet is 1.2° to the upper left of ζ Psc and 3.4° to the lower left of ε Psc.

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 December.

2021, April 25: Mercury-Venus Conjunction, Mars, Bright Moon

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.

2021, April 24: Evening Star, Bright Mercury, Venus, Mars, Gibbous Moon

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.

2021, April 24: Lunar Occultation, Morning Planets, Jupiter Saturn

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.

2021, April 23: Evening Star Venus, Mercury, Mars, Moon

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.



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