For concentrated solar polar, you need almost constant movement of the mirrors to keep tracking the sun well enough.
So you need independent azimuth+elevation for each mirror.
So you need independent azimuth+elevation for each mirror.
There’s always a performance/cost target you’re trying to hit. Sometimes it’s not about performance at all costs and it’s ok to sacrifice some optimality to get a much cheaper solution.
So while the mirrors are independently adjusted, the there’s a single motor robot on a rail that comes by and custom adjusts each mirror instead of having the mirrors self adjust locally at all times.