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SkyVoyager (App Store link) is a powerful planetarium program for the iPhone and the developers are offering it for free today only. To commemorate the 40th anniversary of the first manned lunar landing, they have reduced the price from $14.99 to free. It contains a database of 300,000 stars to 10th magnitude, and 30,000 deep sky objects, including the entire NGC and IC catalogs. It renders the planets and moons in detail, using NASA mission imagery, and includes a database of several hundred asteroids, comets, and artificial satellites.

Source: everythingiCafe