| http://www.w3.org/ns/prov#value | - d world model. * Accurate day/night and lighting effects synced to real time. * Correct sun, moon, star, and planet placement (and correct phase of the moon.) * Ability to automatically sync with real weather conditions via the internet. * Flexible, adaptable, interfaceable, open architecture. * Complete source code licensed under the GPL. * Ported to many platforms including Windows, Max OS X, Li
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