Jo - What a great explanation of the problem! The app that David Pilling posted *_Sun and Shade Analyzer (_**SASHA* <https://play.google.com/store/apps/…>*_)_*essentially solves the problem you describe. I actually did not know the term "Sun Window" when I started writing the app - yours is the first response to my marketing of the app which shows an in-depth understanding of the issues involved. It would be relatively easy to plot such a "shade map" (which is what I called the same concept) by using the app to take measurements at many different points, plotting them, and interpolating to get average sunlight isometrics. This would be far simpler and more accurate than any of the manual methods you describe. I encourage you to get the app and try it out -- right now, it's quite cheap. The question I have for you is the following: How many gardeners/landscapers would actually do this? I.e. would it be worth the effort to add support to the app? It would work something like this: A gardener would have to 1) lay out a grid on the proposed gardening site, 2) use the app to take a reading at every intersection in the grid and enter the intersection's coordinates. The app could then generate a map indicating the shade density at every location in the site by interpolation. It would look like a topographical map, but the curvy lines would indicate hours of direct sunlight. Thanks __*__* -- George Koulomzin Hook Mountain Software Development, Inc. 7 Bridge Hill Lane, PO Box 781 Bridgehampton, NY, 11932 (c) 914-393-6179 george@HookMountain.com _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…