2021, April 13: Crescent Moon, Mars, Evening Sky

2021, April 13: Forty-five minutes the moon and Pleiades are in the western sky.
2021, April 13: Forty-five minutes the moon and Pleiades are in the western sky.

April 13, 2021: The crescent moon returns to the western evening sky after sunset.  Mars is now above the Bull’s horns in the west after sunset.

by Jeffrey L. Hunt

Chicago, Illinois:  Sunrise, 6:13 a.m. CDT; Sunset, 7:30 p.m. CDT.  Check local sources for sunrise and sunset times for your location.

Thirty minutes after sunset, the new moon, that is only 3% illuminated, is about 12° up in the west.  Use a binocular to first locate the lunar crescent.  As the sky darkens, it appears lower in the sky.  The crescent sets at about 100 minutes after sunset.

By an hour after sunset, the moon is still nearly 7° up in the west-northwest and nearly 17° below the Pleiades star cluster. Use a binocular to see earthshine on the night portion of the moon and to spot a dozen or so stars in the star cluster.

2021, April 13: After sunset, Mars is above Elnath and Zeta Tauri (ζ Tau), the Bull’s horns.
2021, April 13: After sunset, Mars is above Elnath and Zeta Tauri (ζ Tau), the Bull’s horns.

At this hour Mars is about halfway up in the west, well-above the “V” of Taurus made by the Hyades star cluster and Aldebaran, and nearly 40° to the upper left of the lunar crescent.  Mars is above a line from Elnath to Zeta Tauri (ζ Tau), the Bull’s horns.

The Red planet is 4.1° to the upper left of Elnath and 3.7° to the upper right of Zeta Tauri. It sets over 5 hours after sunset.

Here’s more about Mars during 2021.

Read about Mars during April.

Detailed Note: One hour before sunrise, Saturn is 16.0° up in the southeast.  Jupiter continues to slowly move away from the Ringed Wonder.  This morning the gap is 13.3°.  The Jovian Giant is over 11° above the east-southeast horizon.  Use a binocular during several mornings to estimate the speed of each planet compared to the starry background.  The changes are small but noticeable when observed across several mornings.  This morning Saturn is 1.8° to the upper right of θ Cap.  Jupiter is 2.5° to the upper left of Deneb Algiedi and 0.5° to the upper right of μ Cap.  Thirty minutes after sunset, the moon (1.9d, 3%) is nearly 12° up in the west. Thirty minutes later, it is less than 7° in altitude.  At this time, Mars is less than halfway up in the west between the horns of Taurus.  It is above a line from Elnath to ζ Tau.  The planet is 4.1° to the upper left of Elnath and 3.7° to the upper right of ζ Tau.

Read more about the planets during April 2021.

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