While eQuest and TRACE 700 have excellent shading algorithms (basically the same algorithm in both software pacakges), the complex input of some shading devices is intimidating to new users of the program, and often overwhelming for experienced users. I would like to propose a method to simplify shading for most applications to that of a simple overhang.

**Consider this overhang:**

Let’s say for now, that is possible to simplify nearly any fixed shading application to such an overhang.

There are only two sets of conditions we need to consider:

The percent of the area shaded when the sun is at the horizon (Θ = 0 degrees) The incident angle of the sun (Θc) where the window is completely...
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