Help with Brise Soleil openings

Hello all,

I am new to this discussion board and to grasshopper all together.  I hope that I can explain the problem I am trying to solve properly so that someone can point me in the right direction.

Basically, what I am trying to do is create a brise-soleil facade system, on an elliptical building, so that the size of the openings block out any direct sunlight.  So basically the variables that I am trying to control are the height of the openings, and the width of the openings, while the depth of the openings remain constant.  I've seen ways to use a single attractor point to regulate openings in a curved surface, but I am trying to take into account the entire sun path from winter to summer solstice so that the openings block direct sunlight all year round.  Also I would like to take into account the times of day where light is blocked out by surrounding buildings

I have been trying to do it manually in Rhino, and it is proving to be very time consuming.  What I have been doing is finding each sun angle acting on a given side of the facade and determining the height to width ratio that blocks out all the sun.

I hope that this is clear.  If I left anything out please let me know.  Any help would be greatly appreciated.