FRIDAY, OCTOBER 9

■ Soon after dark, you'll find bright Arcturus low in the west-northwest at the same height as bright Capella low in the northeast. When this happens, turn to the south-southeast, and there will be Fomalhaut at about the same height — exactly so if you're at latitude 43° north (Boston, Buffalo, Milwaukee, Boise, Eugene). If you're south of that latitude, Fomalhaut will be higher than the other two. Seen from north of there, it will be lower.

SATURDAY, OCTOBER 10

■ The Great Square of Pegasus still balances on its corner high in the east in early evening. Extending away from the Square's left corner is the main line of Andromeda, three 2nd-magnitude stars about as bright as those of the Square and spaced similarly far apart.…