Here’s another image from my last lunar observing session (Sunday 16 January). You can clearly see the three big craters Theophilus, Cyrillus and Catharina on the southern half of the Moon. Through the telescope, Rupes Altai was the most prominent feature with its brightly lit rim. Rupes Altai marks the southwestern rim of the Nectaris Basin. As I promised earlier this week, a more detailed report will follow in the Solar System section.