I’ve been doing work with LiDAR derived terrain images recently and having a bit fun with Hill Shading. In doing so, I’ve come across a web tool, the NOAA Solar Calculator, that allows one to “Find Sunrise, Sunset, Solar Noon and Solar Position for Any Place on Earth“ for any user specified date and time of day. For Manifold users the calculator returns place precise Azimuth and Elevation data. The URL for this tool is: https://www.esrl.noaa.gov/gmd/grad/solcalc/. A reference to this tool might be a useful addition to the Hill Shading topics in the Manifold User Manual.