XEPHEM27, MOTIF TOYS, An interactive astronomical ephemeris for X WINDOW Welcome to xephem v2.7.1 Xephem is an interactive astronomical ephemeris program for X Windows systems. 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 supports user-defined objects; comes with sample databases of over 20,000 objects in the release kit; can access the Hubble Guide Star Catalog from CD-ROM using gscdbd; can quickly locate all pairs of objects which are closer than a specified maximum; displays data in configurable tabular forms and in several detailed graphical formats; can plot and list all data fields to disk files; can be programmed to search for arbitrary circumstances;