Just to explain the curiosity about how the sky texture is aligned. In this example, with absolutely no rendering ambitions, the aim is to visualize light on a building. Sun path at winter and summer solstice on the background. 2048×512 canvas/texture, degrees and sun path are relatively correct on canvas (the rest of the rest of the sky-texture is based on a couple of random + gradient sky and noon/May Sun).

See the 3D viewer for the full picture. The rendered photo seems more correct than the 3D view - but still off. Would it be useful if celestial objects were correctly placed on the sky texture? Or, more likely, is there a reason for this projection that I am missing? More a question of curiosity than anything else.

ok