When a year with 366 days starts on a Monday, it's inevitable Friday the 13th will occur twice. In 2024 Friday the 13th comes in September and December.
The Andromeda galaxy is the closest big galaxy to our Milky Way. At 2.5 million light-years, it's the most distant thing you can see with the eye alone.
The zodiacal light is an eerie light extending up from the horizon before dawn around the Northern Hemisphere autumn. Southern Hemisphere? Look after sunset!
The Great Rift or Dark Rift is a darkened swath of the Milky Way where new stars are forming. It's best seen from a rural location away from light pollution.
The Northern Cross is an asterism - or recognizable pattern of stars - within the constellation Cygnus the Swan. Learn how to find it in your sky here.
Bruce McClure served as lead writer for EarthSky's popular Tonight pages from 2004 to 2021, when he opted for a much-deserved retirement. He's a sundial aficionado, whose love for the heavens has taken him to Lake Titicaca in Bolivia and sailing in the North Atlantic, where he earned his celestial navigation certificate through the School of Ocean Sailing and Navigation. He also wrote and hosted public astronomy programs and planetarium programs in and around his home in upstate New York.