The Solar Pathfinder and Assistant provide mathematical precision for accurate shading assessment (solar site analysis) by eliminating gross errors in structure orientation, solar system sizing, and PV/collector placement. The Solar Pathfinder Assistant software dovetails local weather data (using NREL/WMO) and site-specific shade analysis in a customizable report. Originally furnished for the ecological and photovoltaic applications, the Assistant software now services the growing thermal technologies. Regardless of the industry being serviced, the software identifies the shading patterns and total potential energy produced at any given site.