Abstract: A mounting system for a heliostat is provided that allows the heliostat to move with respect to two orthogonal axes to track the sun. The mounting system has features that allow the heliostat to precisely and accurately move about these axes even as various components degrade during operation in harsh environments and over long time periods. Embodiments of the mounting system can have a frame that supports multiple mirrors and translates forces from the mirrors to multiple hubs that move about a circular track. One of the hubs can include a fewer number of contact points to accommodate a circular track that is out of round. In addition, an actuator that moves the hubs around the circular track can be biased into the track to also accommodate a circular track that is out of round.