Saturn, Mars, Delta δ Scorpii, and Antares form an equally-spaced ragged line in the southwest at dusk, as shown at right. Delta Scorpii used to be a bit dimmer than Beta above it. Then in July 2000 it doubled in brightness. It has remained bright, with slow fluctuations, ever since.Look high above the Moon this evening for Altair.

read more This Week’s Sky at a Glance, September 5 – 13 | Sky & Telescope.