Stellarium for Java is a Java version of Stellarium, a free GPL software which renders realistic skies in real time. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope. Stellarium is also used in planetariums.

Stellarium for Java (S4J) aims to provide the same functionnalities as the original Stellarium but over the Java platform, thus allowing both a greater portability accross platforms and low level APIs (OpenGL, Direct3X) and evolutivity, as well as lighter and easier coding.

PC screenshots:

Constellation lines Azimutal grid and configuration dialog
A sunset A zoom on Mars

Mac screenshots:

A sunset


Check out S4J feedback: