sunlight drawing

My dad asked me a few weeks ago if I could transform his ginormous front lawn into a luscious flower garden. So, I googled a few garden advice sites that emphasized two factors: sunlight and soil pH. I assigned my engineer dad some homework: email me a few drawings of how the sunlight falls onto his front lawn in the morning, noon, 3pm, and 6pm. This is what he came up with:

I was expecting a hand-drawn diagram, or at best, a few photographs of his front lawn. But, AutoCAD will do, I guess.

Once I learn to decode this "drawing", I'll have an idea of which areas will have a ton of sunlight (8 hours+) and which areas will have partial sunlight (I'm not exactly sure what this means, yet). Then, I can help him pick his plants. I'm still waiting for him to send me his soil pH test results. More on that later.