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2021, December 16-18:  Evening Moon, Bull

Full moon

Full Moon (NASA Photo)

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December 16, 17, 18, 2021:  The bright moon appears in front of the stars of Taurus.  Find them low in the east after sunset and in the western sky before sunrise.  The moon is Full at 4:35 a.m. on December 19.

Chart Caption – 2021, December 16-18: The bright moon is in front of the stars of Taurus in the eastern sky after sunset.

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By Jeffrey L. Hunt

With three bright planets – Venus, Jupiter, and Saturn – in the southwest after sunset, the bright moon is in the eastern sky in front of the stars of Taurus.  The lunar luminescence overwhelms the background stars.  Shield your eyes from the moon’s glare or use a binocular to find the stellar backdrop.

Here’s what to look for:

December 16:  The bright moon – 96% illuminated – is 4.9° below the Pleiades star cluster.  The lunar orb and the cluster easily fit into the same binocular field. To reduce the moon’s glare in the view, move the binocular until the lunar orb is outside the field of view, but the cluster is visible.

December 17:  The moon – 99% illuminated – is 7.2° to the upper left of the star Aldebaran.  With the Hyades star cluster, Aldebaran makes a sideways “V” that marks the head of the mythological Bull.  Look at the bunch with a binocular.  The moon is well outside the field of view.

This view of the Crab Nebula in visible light comes from the Hubble Space Telescope and spans 12 light-years. The supernova remnant, located 6,500 light-years away in the constellation Taurus, is among the best-studied objects in the sky. Credits: NASA/ESA/ASU/J. Hester

December 18:  The moon – 100% illuminated – is seemingly caught between the Bull’s horns – Elnath, also known as Beta Tauri, and Zeta Tauri.  The moon is 3.9° to the upper left of Zeta and 4.9° to the lower left of Beta.  The two stars are too far apart for both of them to fit into a binocular field, so the moon fits with only one star aThe Crab Nebula is just 1° above Zeta Tauri and 3.3° to the lower right of the moon this evening. The cloud is the result of a star that exploded in the year 1054.  It is a challenge to see even through a telescope, but the lunar globe is in the vicinity of the sky where one of the most important celestial objects is located for our understanding of the universe.  It is an exploded star.  It has a rotating neutron star at its center and produces light and other forms of energy by accelerating matter along magnetic fields. A large telescope and a long exposure photograph reveals the Crab’s wonders. With the moon’s brightness, this is not a good evening to look for the nebula.

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