To be most effective, a windmill must face into the wind. Some windmills achieve this with a passive yaw system, where the wind automatically adjusts the direction the windmill is facing, often with a tail fin.
For my story, space fairing people use mirrors to focus sunlight onto water boilers, forges, and other places where intense heat is needed. Could some type of solar sail tail fin be used as a passive yaw system for directing these mirrors into their optimal orientation? The mirrors are attached to physical objects (space stations, ships, asteroids), not free floating, and they are typically in the vacuum of space with microgravity comparable to the ISS. A mirror is a 3 meter square sheet of silver curved into parabola.
Concentrated solar facilities on Earth seem to always use active controls (electric motors) to move solar mirrors into position. I assume a passive yaw system would not be practical on earth, where air resistance (not to mention wind!) and gravity create significant resistance, and solar wind is deflected by our planet's magnetic shield. I wonder if a passive system would be easier to achieve in space, where there is vacuum, low gravity, and the presence of solar wind.
Is passive yaw control possible for directing space mirrors into the sun? If so, what would such a system look like?