Tonight, October 21, 2025, you can see two notable comets, Comet Lemmon and Comet SWAN. The best time to see them is about 90 minutes after sunset for roughly a 30-minute window. Comet Lemmon will be visible in the northwest sky near the bright star Arcturus and the Big Dipper handle, while Comet SWAN will be visible in the southwest near the Summer Triangle constellation. Both are best seen with binoculars or a telescope, ideally from a dark sky location free from light pollution. In New York City, for example, sunset is around 6:03 p.m. EDT, making the prime viewing window from about 7:30 to 8:00 p.m. EDT. From there, locate Lemmon above and to the right of Arcturus at about 18 degrees elevation in the northwest. Look for SWAN in the southwest at around 38 degrees elevation near the star Altair of the Summer Triangle. These comets are relatively bright and could possibly be seen with the naked eye under dark conditions, especially Lemmon which is expected to brighten toward Halloween. If you are in the Northern Hemisphere, step outside about an hour and a half after sunset and use star charts or apps like Stellarium, Sky Guide, or SkySafari to help locate them precisely. For the best experience, find a dark place, allow your eyes to adjust to the darkness, and bring binoculars for a clearer view. This is a rare celestial event and a unique opportunity to see two comets close to Earth in the same night sky.