Model a heliostat with a drill press, laser pointer and mirrors?
But now, solar energy is becoming important again. Big fairly low efficiency mirrors can be made with mylar stretched across a frame.
Perhaps now is the time to get 1 mirror heliostat research going again!
(With low efficiency mirrors, 70% efficiency becomes 49% if you use 2 mirrors to reflect the light) So you get less efficiency for twice the expense if you use 2 mirror heliostats!
But first we need to model the process. It just takes too long to test your ideas outside!
Here is the start of my model of mirrors on an equatorial mount (also called a polar mount) and the sun moving on the celestial sphere. I think that it will end up being very useful. I just gotta find the right mirrors and the right laser pointer. A heliostat with the mirrors moving at one rotation every 2 days, can do this perfect reflection but it is limited to certain angles because the mirror must be upright on the mount.
In my model, I have left out the earth's surface for them moment. So we will just model the suns movement, the heliostat mirror movement and have a target to see how much the reflection moves too.