Apps similar to TOPCAT include Stellarium, which is free and open source. Other options are Sky Map, KStars, Gaia Sky and Solar System Scope. You can choose from more than 10 Star Maps like TOPCAT for Windows, Mac, Android, iPhone and iPad.
SkySafari is a powerful planetarium that fits in your pocket. It puts thousands of stars and planets at your fingertips. It lets you find objects in the sky using your device's built-in compass and accelerometer.
United States
StarMap 3D Plus is the portable star atlas for beginners or advanced astronomers. Use StarMap 3D Plus to find the planets, stars, constellations, star clusters, galaxies, and nebulae visible to you based on your location and time.
The Night Sky app enables you to identify the stars, planets, galaxies, and constellations you can see above.
Displays the sky view at the correct orientation when held at any angle not just landscape or portrait. Simple operation, no buttons to press or modes to select, just point to the sky to start exploring.
United States
Aladin is an interactive sky atlas allowing the user to visualize digitized astronomical images or full surveys, superimpose entries from astronomical catalogues or databases, and interactively access related data and information from the Simbad database, the VizieR service and...
This program enables you to draw sky charts, making use of the data in 16 catalogs of stars and nebulae. In addition the position of planets, asteroids and comets are shown.
Switzerland
United States
The Sun's and Earth's rotation axes are both tilted with respect to the ecliptic, the plane of the Earth's orbit around the Sun.
France
EU
