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Thank you for the interesting experiment. I have a question:You say "Remove the solution once 00-50 ml of the solution is left."What does that mean? You mean between 0ml and 50ml left?My solution grew a white crust over the whole surface when there was still 150ml left. Did I do something wrong? I added a bit of water, and am trying now again.
One additional method is using a mirror. Take any mirror (doesn't have to be round, though round gives sharper images). Reflect the sunlight to a shaded area, far away. You get a great image of the sun. I tracked once a venus transit, which is also a type of eclipse....
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This is pretty nice! Have you tried replacing half the arrays with mirrors?