Outstanding design and implementation! Really great for visualizing the sun, earth, and seasonal relationships!

One minor nit I notice is the Latitude slider on the right seems reversed from what I'd expect. I would expect Slide UP to move North and increasing positive latitude numbers, and DOWN for South/negative, but this implements the opposite. It seems this may be to match the Longitude negative numbers at the top, but that convention seems a lot less necessary, i.e., either would work for longitude and +=UP/-=DOWN for latitude seems like it is more important to match with the physical and mental models?

Thanks for the cool tool, I'll be using it a lot for garden planning and solar panel install (and just cool to look at)!