2021, November – December: Venus, Sagittarius

2021, November and December, Venus moves eastward through Sagittarius.

For nearly 40 days, Venus moves eastward among the stars of Sagittarius.  During early December, it reaches its greatest brightness. It gleams in the southwestern sky after sunset. On November 7, the moon joins Venus. A second grouping occurs on December 6. The planet and the moon appear together in likely their best show of the apparition.  Venus is very bright with a crescent moon under it.  The planet stops moving eastward after mid-December and begins its rapid descent from the evening sky.

Look for Venus low in the southwest about 45 minutes after sunset.

To follow the planet’s eastward trek through the constellations, see this semi-technical summary.

On November 6, Venus passes 3.1° to the upper right of Alnasl (γ Sgr on the chart).  The star represents the “point of the arrow,” of Sagittarius’ mythological creature.

2021, November 7: The crescent moon is 3.9° to the lower right of the brilliant planet.

The next evening (November 7), the moon makes its monthly grouping with the brilliant planet. The crescent moon is 3.9° to the lower right of the brilliant planet.

Venus continues its eastward trek. On November 10, it passes 2.6° to the upper right of Kaus Media (δ Sgr), “the middle part of the bow” of Sagittarius.  Two nights later, it passes Kaus Borealis (λ Sgr), “the northern part of the bow.”

Venus passes 0.2° of Phi Sagittarii (φ Sgr) on November 16.  A binocular helps to separate the planet and the star in the field of view.

Three nights later, the brilliant planet passes Nunki (σ Sgr), “the yoke of the sea.”

The planet continues to set later, appearing higher in the south-southwest at nightfall.

2021, December 7: Venus is at its midpoint of its period of greatest brightness. The planet is approaching Earth.

On November 27, the planet begins its interval of greatest brightness until December 14.  The planet’s brightness will increase slightly during this interval of time, but likely the change is invisible to the unaided eye.

2021, December 6: Brilliant Venus is 3.2° above the crescent moon.

While not the closest grouping of Venus and the moon, the December 6 pairing occurs when the planet is very bright. The moon phase is only 10% illuminated.  Use a tripod-mounted camera and a time exposure to capture earthshine on the moon.  Through a telescope, the moon is only 24% illuminated.

On December 18, the planet stops its eastward trek and it begins to retrograde as it moves rapidly toward its inferior conjunction.  By December 26, Venus is setting again at the end of evening twilight.  It loses about 7 minutes of setting time each evening.

2021, December 28: Venus is 4.2° to the upper right of Mercury.

On December 28, Venus and Mercury are 4.2° apart.  Saturn and Jupiter are to the upper left of brilliant Venus.

Venus as an Evening Star Article

2021, July 26: Evening Sky, Mars Closes In

July 26, 2021:  Four bright planets are in the evening sky.  Mars closes in on Regulus for their conjunction in three evenings.  Brilliant Evening Star Venus appears to the upper left of the impending Mars – Regulus conjunction.  Saturn and Jupiter are low in the southeastern sky after sunset.

2021, July 25: Evening Sky, Mars on Final Approach

July 25, 2021:  Four evenings before its conjunction with Regulus, find Mars in the western sky to the lower right of Venus.  As the calendar day ends, look for the moon below bright Jupiter.

2021, July 24: Four Evening Planets, Moon

July 24, 2021: After sunset, Venus and Mars are in the western sky.  A little later during evening hours, the moon is near Jupiter and Saturn in the southeast.

2021, July 29: Jupiter – Mars Opposition

July 29, 2021:  Jupiter and Mars are 180° apart along the ecliptic.  Dim Mars sets in the west-northwest as Jupiter rises in the east-southeast.  This event signals that soon both appear in the sky simultaneously.

Categories: Astronomy, Sky Watching

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