Star Walk 2 by Vito Technology is Apple’s free app of the week. The app normally retails for $2.99 and is free for this week only.
The app is a next-generation tool for not only learning the exact position of stars, planets, constellations, comets, ISS, satellites, star clusters, nebulae and meteor showers in the night sky but also for investigating its’ depth like watching constellations, nebulae and satellites from aside.
Star Walk 2 is the first astronomy guide to introduce plausible three-dimensional models of planetary nebulae. Star groupings of the 88 officially recognized constellations are also presented in volume. You can see them as separate entities, turn them around and take a look from the other side. Complemented by articles on connected myths and history, this is the most comprehensive collection of information on constellations.
Star Walk 2 is available as a free download (normally $2.99) from the App Store. The app requires any device running iOS 7.0 or later, and it has been optimized for the iPhone 5, 6, and 6 Plus. The app has in-app purchases that range between $1.19 and $3.49.