Probably people might enjoy playing around with some of these. 2D sunpath is a go to - you can easily get the seasonal sun angles for different orientations, then figure out what proportion of overhang you need. https://andrewmarsh.com/software/
V nerdy and v cool - in the past Ive geolocated a SketchUp model and used the sun shadow sliders - never convinced on accuracy tho.
@hoefla started
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Probably people might enjoy playing around with some of these. 2D sunpath is a go to - you can easily get the seasonal sun angles for different orientations, then figure out what proportion of overhang you need.
https://andrewmarsh.com/software/