Ryder Devenhall marks the shadows as seen in the pyranometer while Jesse Hesch and Mitch Frank look on at UNM-LA. Students in Don Davis’s Photovoltaics class at the college use a pyranometer to do solar site analysis on campus. By taking readings at various locations, they can measure solar obstructions and chart the overall available solar resource. Photo by Nancy Coombs/UNM-LA