JupiterViewer displays the Galilean moons of Jupiter in two different types of diagrams. Java 2 (version 1.2.2 or higher) is required in order to run this application. Programmed and tested on a Red Hat Linux 6.2 machine with Java 1.2.2 SDK and also tested with Windows NT. Other OS's should (maybe;) work as well... Please report bugs to jv_bug_report@yahoo.com.