Friday, October 23

The Moon passes 5° north of Neptune at 11 P.M. EDT; you can catch the pair in the south around that time, along with Saturn in the southwest, just to the Moon’s lower left. Saturn is visible to the naked eye, but Neptune is not. The distant ice giant will require binoculars or a telescope to spot and may still be a challenge, hanging below the bright Moon in Pisces.

Above the Moon, look for the four bright stars that form the Great Square of Pegasus: Algenib, Alpheratz, Scheat, and Markab. Alpheratz, at the upper left-hand (northeastern) corner of the Square, is not technically within the bounds of Pegasus, and is officially cataloged as Alpha (α) Andromedae, in the constellation Andromeda.…