A free program for Android, by iwpSoftware.
PlanetDroid is the perfect companion for any amateur astronomer or planetary observer. It provides quick access to the most important data for planning and conducting observations, and allows you to calculate precise positions and phases of the planets and other celestial bodies.
The app includes ephemeris for all the planets and moons, as well as a large selection of asteroids and comets. In addition, it contains a large number of celestial objects, such as stars, galaxies, and even black holes. It can also calculate nautical charts for any location.
You can easily access the data you need, including:
The current positions of the planets and moons.
The current time.
The positions of the sun, moon, and other celestial bodies.
The phases of the moon.
The nautical charts for any location.