The Photographer's Ephemeris for iOS
(formerly The Photographer's Ephemeris for iPhone) has been upgraded to v2.0 and now takes advantage of the greater available screen real estate when used on an iPad. (It's still compatible with the iPhone.) An application designed to help photographers plan outdoor shoots, The Photographer's Ephemeris calculates time and position of sunrise/sunset and moonrise/moonset, as well as several other geographic, solar, lunar, and temporal parameters, for any place name or map position on Earth. It's available from the iTunes App Store for US$8.99.