SunPath: sun path calculator and shadow tool

Calculate solar altitude and azimuth for a location, date and time. Compare seasonal sun paths, study 3D building shadows, prepare solar diagrams and generate printable architectural reports.

Plan a sunlight study

Start with a location and true-north orientation, add building massing and nearby obstructions, then compare winter, summer and occupied hours. SunPath is an early-design geometry tool; clear-sky estimates do not establish indoor daylight, thermal performance or code compliance.

Read Designing Homes Around Sunlight, check the calculation methodology, or explore the window and shading example.

The interactive calculator requires JavaScript and a WebGL-capable browser.