Solar Pergola

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an open door and wooden slatted roof
Passive solar pergola
The slats are angled to the winter sun such that light can hit the windows during the cooler months, warming the back room. In the summer the slats block most of the direct light to the windows, while still creating a pleasant dappled light. Simon Marshall Horticulture and Design: Passive solar pergola
the diagram shows how to use different angles and directions for an object that can be seen in
Shading
Fixed louvres are set so that spacing between louvres is 75% of their width, angled for mid-winter sun height to allow winter sun but block summer sun.