“Star Walk” is a pocket planetarium lesson and astronomy guide for the iPhone/iTouch. This sophisticated application is chocked full of features including moon phases, bookmarks, and a time machine (which allows you to view planetary and star movement in the days to come). It is easy-to-use, nicely formatted, and offers a wealth of learning opportunities. My favorite feature is the “star spotter” option that uses the digital compass to orient your location/position and charts the constellations over head (available for the 3GS only). I also like the option to learn more about what you see through links to planetary information on Wikipedia. This application is a superb tool for parents/caregivers who want to teach their young ones about the sky above. It’s the best of its kind, and an excellent way to discover and explore the universe from wherever you stand.

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