empecemos:
- iEphemeris: fases de la Luna (gratuito). Lo recomiendo

- Astronomer: estrellas y planetas ... 2 euros. Bastante basico.
- GoSkyWatch: otro planetario, lo ponen bien pero no lo he probado. (8 euros)
Aqui tenies una revision del programa: http://www.appleiphoneapps.com/2008/08/ ... anetarium/
Una fotilllo:

- iAstronomica (7 euros): estrellas, fases de la luna, constelaciones....me quedo con el STARMAP.

- STARMAP: creo que es el mas completo, esta es la web: http://www.star-map.fr/ con muchas caracteristicas. Sale por 10 euros.
Hay revisiones que ponen muy mal la velocidad de refresco pero la version actual la han mejorado bastante (20fps)

En ingles:
Full ephemeris of the 9 planets and their satellites, including rise and set time as well as moon phases.
110 000 visible stars
250 main stars with names, kind and colors.
Shows all the northern and southern constellations.
150 deep field objects like galaxies and clusters, including photos.
The 100 main meteor showers, with dates, intensities and locations.
Easy navigation with the star pointer. Helps you locating stars, planets constellations and galaxies.
Complete equatorial and azimuthally coordinates grids for advanced users.
Ecliptic and celestial horizons for an easy location of planets.
Coordinates of 250 cities all over the earth, or use the auto-location of the device.
Easy navigation with cardinal points at your location.
Integrated lamp and full night vision mode.
Includes planets and constellation zodiacal signs.
Automatic view point altitude selection with the device accelerometer.
Stars and twilight adjustment, taking into account your observation conditions.
Integrated help for easy learning.
Direct database search for advanced users.

Saludos!!!