Sol

Sol is one of the two founding systems of the United Empire of Sol and Proxima. The other, of course, is Proxima. As of the 6th Century GY, Sol is considered to have two inhabited planets (Earth and Mars), as well as several minor colonies on the various moons and asteroids of the system.

The United War Colleges is the primary training institute for the Imperial Guard and is located in Sydney, Australia on Earth. The Imperial High Command is located just outside Ares, on Mars.