Backyard Astronomer - Delta College Public Radio Delta College Public Radio

Observe the night sky long enough and you’re bound to see something strange that’s hard to identify. It’s easy to think of a UFO, but that doesn’t automatically mean it’s an alien spaceship.

In binoculars, look near the very center of the lunar disk for a large crater that seems to have a dark, smooth floor. This is Ptolemaeus, named for Claudius Ptolemy, an astronomer of ancient Greece. Two more large craters in a line below Ptolemaeus, Aphonsus and Arzachel, complete the chain.

The moon is "new" this week, which keeps the night sky dark enough to see more stars and deep sky wonders. One distinctive little springtime constellation to look for in the south is called Corvus, the Crow.

Each season has that one constellation that serves as a signpost to the sky. In spring, many stargazers use the zodiacal constellation of Leo the Lion.

Mid-April to mid-May is a good time to see a collection of bright stars in the west called "The Arch of Spring."

As the phase of the moon grows steadily from Crescent to First Quarter to Full, it’s a good opportunity to explore the contrasts of light and dark on its surface.