Read our editorial mission (Opens in a new window) & see how we test (Opens in a new window). Since 1982, PCMag has tested and rated thousands of products to help you make better buying decisions. Stellarium does a very good job in depicting the changing light of twilight. In daylight, unlike some programs that still show a star-filled sky, Stellarium only shows the objects you can see in daylight (the Sun, the Moon, and Venus). In daytime, when it's unsure of your location or in what direction you're facing, it fast-forwards the time to the evening to show the night sky otherwise it shows the sky at the current hour. When you open the app, you're presented with a view of the sky. I tested Stellarium Mobile with an iPad Air ($389.99 at eBay) (Opens in a new window), though it's also usable on an iPhone ( at Amazon) (Opens in a new window). Though it loses a few features, it retains the program's beautiful, and for the most part realistic-looking, depiction of the heavens. Stellarium Mobile (for iPad), created by two of the developers of the desktop versions of Stellarium, brings the program to your iOS device. Stellarium is a well-known name to astronomy buffs that have long used the open-source program on Windows, Mac, or Linux desktops.

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