Length and angle of awning to block sun in summer and let it through during winter? – GreenBuildingAdvisor

I want an awning to allow sun in during the winter and block it during the summer. Is there an online calculator where I can put in my latitude and longitude and it will tell me the length and degree at which to building an awning for my windows? I assume the height of the windows matter as well? I plan to plant fruit trees 10-15 feet from my house to eventually do this but I’d like to have the awnings in the interim 4-5 years.

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