evasive_chimpanzee , 7 hours ago

I haven't watched the video yet, but vernacular architecture back in the day commonly set shading elements like awnings at the right height/angle such that during midday in the winter, sunlight would still directly go through windows and hit interior floors and walls. During summer, the angle of the sun would be high enough that direct sunlight could not reach windows.

You can get pretty far with just those passive designs. There are tools to help you find the dimensions you'd need based on where you live without having to do any calculations yourself.