we'll call it Shady Lane

I need an app that maps the shadiest pedestrian route, for any given time of day. Nothing too complicated. Just, you know, an algorithm that calculates the position of the sun relative to building height, trees, sizable landmarks, etc., factored down to the minute so as to maximize the amount of shade one enjoys while walking.

I am convinced that between Google and NASA, the data have already been collected. All that remains is some number crunching.

So can someone please crunch those numbers? Walkability scores are everything nowadays. There's gotta be $$$$ in an app like that.