astro/xephem 3.2.3p9 OpenBSD

Xephem is an interactive astronomical ephemeris program for the X Window system. It ...

computes heliocentric, geocentric and topocentric information for fixed
celestial objects and objects in heliocentric and geocentric orbits;

has built-in support for all planet positions; the moons of Jupiter, Saturn
and Earth; Mars' and Jupiter's central meridian longitude; Saturn's rings;
and Jupiter's Great Red Spot