Where can I get the necessary info to model the exact movement of any point on earth relative to the sun for the next thousands of years? I'm making a program that actively corrects the angle of a mirror throughout the day such that the reflected rays always hit a fixed point. I understand this can be done with an approximation and fixed values, but I decided that I was going to go for a level of precision so autistic the physical motors wouldn't be precise enough. I don't know where to find the information or any resources that would teach me what I need to calculate it myself. Any links or book recommendations would be heavily appreciated.