[jmpman]

So, you have a calibration target on the tower, along with the actual power generating target? Allow each mirror a brief time slice to hit the calibration target to ensure alignment before returning to the power generating target? Maybe you can calibrate more than 1 mirror at a time, and like old fashioned medical diagnostic tests, they can determine the optimal number of mirrors to calibrate simultaneously? That seems unnecessary at least with the number of heliostats I see in the image. Once calibrated, I’d expect the heliostats would operate acceptably for at least a month.