Make a sidewalk solar system

Silver City, NM, put in a permanent Sidewalk Solar System.
http://nfo.edu/solar/index.html
You probably can't just go install one like they did, but you can make one using sidewalk chalk and a little research.

Here are their instructions:
http://nfo.edu/solar/direct.htm

Plus a link to the data they used:

http://nfo.edu/solar/guide.htm