First of all a big thank you to "Usbport" on the CR4 engineering forum for pointing out the wikipedia graph that my graph is based on. This was the first step to getting the whole thing taken seriously. I have been looking into how much direct sunlight comes from north of the east west line and there is stuff to clarify. First of all the degrees of sunlight and the amount of daylight/nighttime hours does not tally. Also, if you look at the sollumis screenshots, they have "rays" of sunlight. I presumed they are 20 minutes of sun travel but they might just as easily be 5 degrees of sun travel and they are bunched closer in the morning and evening than at midday. I am pretty sure that the sun does appear to be going faster at midday and slower in the evening. I could easily check this if I had not destroyed my model http://www.youtube.com/watch?v=R67f2v4yio4 This really matters because we need a decent idea of how much light we are gaining.

Finally a shout out for art of illusion. It is a free cross platform modeling software that is easy to learn. I firmly believe that this is the best hope to personalize the greenhouse design. The only extra thing that is needed is a Sun engine Scene file. Scene files are downloadable and anyone can make one. (I am crap at it but even I have made a scene file). http://www.artofillusion.org/contribute if you want to talk to the guy who made art of illusion. Here is how it would work. You import or copy your elevation, plan and endview into art of illusion, add the scene file. input the date and run it. It will show the light and shadows from any angle for your entire site for that day! Any decent physics or computer guy could do the scene file, it would look great on your resume and it would be used all over the world for greenhouse, and garden design.