The Moon is in its “gibbous” phase, which means that sunlight illuminates more than half of the lunar hemisphere that faces our way. The dark portion of the lunar disk is in the Moon’s own shadow, so it is night on that part of our satellite world.
Last Week's Stargazing Tips
May 20
May 19
M13, the Hercules Cluster, stands in the east at nightfall, in the constellation Hercules. To the eye alone it looks like a small, hazy patch of light. Small telescopes reveal hundreds of the cluster’s individual stars.
May 18
Hercules is in good view in the east and northeast at nightfall and soars high overhead during the night. The most prominent portion of the constellation is the Keystone, a group of four stars that forms a lopsided square.
May 17
A bright star keeps company with the first-quarter Moon tonight. Regulus, the “heart” of Leo, the lion, stands a little above the Moon as night falls, and keeps that position as they slide down the southwestern sky later on.
May 16
One of the most important stars in the ancient world was Arcturus, in Bootes, the herdsman. The Egyptians, Greeks, and others spun legends around this bright, yellow-orange giant. Arcturus stands high in the eastern sky this evening.
May 15
As darkness falls this evening, the twins of Gemini stand above the western horizon, to the right of the Moon. Leo, the lion, is to their upper left, with Libra, the balance scales, just climbing skyward in the southeast.
May 14
Some of the brightest stars of winter are dropping from the evening sky. Very low in the west at nightfall, look for bright white Procyon in Canis Minor, the little dog. The “twins” of Gemini, Pollux and Castor, are to the upper right of Procyon.
