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2021, April 21: Morning Planets, Jupiter, Saturn, Capricornus

Venus and Moon, December 11, 2020

2020, December 11: One hour before sunrise, the crescent moon is to the upper right of brilliant Morning Star Venus.


April 21, 2021: Jupiter and Saturn are the bright morning planets in the southeast before sunrise.  The stars are in front of the backdrop of Capricornus.  The constellation looks like an oversized boomerang or stealth fighter.

Chart Caption – 2021, April 21: Morning planets Jupiter and Saturn are low in the southeast before sunrise in front of the starry background of Capricornus.

by Jeffrey L. Hunt

Chicago, Illinois:  Sunrise, 6:01 a.m. CDT; Sunset, 7:39 p.m. CDT.  Check local sources for sunrise and sunset times for your location.

Bright Jupiter and Saturn shine from the southeastern sky before sunrise.  Saturn is over 18° above the horizon.  It continues its eastward trek in Capricornus, 1.4° to the upper right of Theta Capricorni (θ Cap in the chart).  Use a binocular to see the stars with this giant planet duo.

Bright Jupiter is over 14° to the lower left of Saturn.  It is the brightest “star” in the region.  In the starfield, it is 3.6° to the upper left of Deneb Algiedi (δ Cap), 0.7° to the lower left of Mu Capricorni (μ Cap), and 2.5° to the upper right of ι Aqr.

Capricornus represents a celestial mutant, part fish and part goat.  It is sometimes referred to as the “Sea goat.”

The constellations is part of a set of three constellations associated with water, Capricornus, Aquarius, and Pisces, that form a backdrop for the apparent motions of the sun, moon, and planets.

The pattern is made of dimmer stars, that make a distinct shape that could be an oversized boomerang or stealth airplane.

The four brightest stars and the meanings of their name:

The meanings of the star names are from 1944 article by George Davis, Jr.

Detailed Note: One hour before sunrise, Saturn is over 18° above the southeast horizon and 1.4° to the upper right of θ Cap.  Jupiter – 14.2° to the lower left of Saturn – is nearly 14° up in the east-southeast.  In the starfield, Jupiter is 3.6° to the upper left of Deneb Algiedi, 0.7° to the lower left of μ Cap, and 2.5° to the upper right of ι Aqr.  Use a binocular to note the changing position of Jupiter compared to the sidereal background.  Twenty minutes after sunset, Venus is over 2° above the west-northwest horizon.  In a darker sky forty minutes later, the moon (10.0d, 68%) is over two-thirds of the way up in the sky above the southern horizon.  It is 7.5° to the right of Algieba (“the forehead,” γ Leo, m = 2.0) and 7.6° to the upper right of Regulus.  In the west about 40° up in the sky, Mars is 3.1° to the lower right of the star cluster M35 and 5.1° to the lower right of Propus (“the projecting foot,” η Gem, m = 3.3). This trio of celestial treasures and other nearby background stars easily fit into the view of wide-field binocular.

Read more about the planets during April 2021.

2021, December 28:  Venus Slips, Mercury Hops

December 28, 2021:  Brilliant Venus is quickly slipping from the evening sky.  Mercury appears beneath Venus after sunset.  This duo is joined by Jupiter and Saturn.  In the morning, Mars is near Antares and the moon near Spica.

2021, December 27:  Mars – Antares Conjunction

December 27, 2021:  The Red Planet Mars passes Antares this morning before sunrise.  At the same hour, the moon is near Spica.  The three bright planets – Venus, Saturn, and Jupiter – are in the evening sky.

2021, December 21:  Winter Solstice

December 21, 2021:  The winter solstice occurs at 9:59 a.m. CST.  Mars is in the morning sky along with a bright moon.  The planet pack – Venus, Jupiter, and Saturn – is in the southwestern sky after sunset.

2021, December 19-21:  Gemini Moon

December 19, 20, and 21, 2021:  The bright moon leading up to the winter solstice appears in the western sky before sunrise in front of Gemini.

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