Nice! Was thinking it'd be cool to have a little tool that calculates the height of an object (tree, building, etc) given the length of its shadow and the time

Nice! Was thinking it'd be cool to have a little tool that calculates the height of an object (tree, building, etc) given the length of its shadow and the time of day (GPS coords might also be necessary). Seems like you've already performed most of the necessary calculations here.