I did a fair amount of sitting on the beach during my vacation this summer. But as any devoted beach goer knows, every hour or so you have to put down your book to adjust your umbrella or your chair’s position under it. I got pretty good at predicting the path of the sun throughout the day, so could minimize my effort. Still, the process gave me an appreciation of just how much moving a solar panel has to do to track the sun. [read more..]