Astro Info is an open-source astronomical ephemeris/almanac for PalmOS. It displays some basic information useful to star gazers, such as rise, trans and set times, coordinates, magnitude and phase information for Sun, Moon, the other 8 planets and stars. It also features a rotatable and zoomable map. Astro Info requires at least PalmOS 3.0. It also works with PalmOS 5.0. The latest version also supports high-resolution displays of PalmOS 5 devices. You use Astro Info by installing it, configuring it, then selecting various functions from the menu. Nothing fancy, or hard to understand. There's even help for each menu option.