Okay, I am officially off my noodle. I plotted 12 planets from north to south for the last 8 turns, and guess what, it doesn't make any sense what-so-ever. I can figure out the radius no problem, and determine where a planet will be the following turn, within about 2 lys, but the center of each planets track seems to be random, and as much as 265 ly from the 2000,2000. I tried to see if there was some constant variable anywhere that could account for the oddities, but the math doesn't add up. The only thing for sure is that a planet will rotate roughly around the centre of the map as a factor of its distance from center. Roughly 9 - 1.2 degrees for every 100 lys from centre. It will be interesting to see what happens as some of the planets track outside the map. Crazy addon. Anyone have any better luck figuring it out.