The Lockheed Martin Solar Astrophysics Lab develops space-borne instruments that must be tested prior to use. The testing is performed in the lab using a stationary image of the sun. The team has designed, built, and tested a computer-controlled, active-tracking heliostat that can stabilize an image of the sun to within one arc-second and allow controlled slewing and offset. Additionally, the team has designed an enclosure to protect the heliostat once it is installed.