Provides functions for setting the local time variable, the Dead Reckoning position, Long and Lat and, from these variables, computing the positions, magnitudes, and phases of the stars, planets and moon, and more. Requires DateLib.
Allows anyone with a telescope equipped with an equatorial mount and setting circles to point and view without any polar alignment. The need for polar alignment is eliminated by a unique system which relies on 2 guide stars.
HPlanetarium is a free (GPL) planetarium for the HP 39/40/48G/49/50 in which you can move, zoom and unzoom the sky map "in real time". Equatorial/azimutal coordinates, rise/transit/set times, elongation, magnitude and diameter can be computed for main planets. You can also point a Meade telescope, and there is an ephemeris generator. Source code for the HP 49 is provided. A light version (only 24 KB) is available for the HP 48G.
A MIDI audio file to MIG file converter for the PC. It converts your preferred song (it must be a .mid file) so that you can listen to it on your HP. Works under both Windows and Linux (sources under the GPL included).