http://www.perlmonks.org?node_id=884206


in reply to Re^3: Lookup closest hash key
in thread Lookup closest hash key

Actually, I don't think he is.
Considering the OP actually gave us an example hash, and an example search query, I'm not going to assume he has figured out how to use spherical coordinates as hash keys. (For which neither Voronoi diagrams, nor quadtrees can be used directly).