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Solar heat gain depend on many factors, you can see a brief overview with this pdf.
Ever wondered how the change in the sun direction at different times of the year affects the window that you want to shade?
Want to use Google maps to see sun directions at any time of year for your location? Use this free application. You can get the latest version (also iOS version) here This also requires Adobe Air (also free) Get Adobe Air here
You can see how much shading any Stobag awning will provide at you window using the Stobag shade planner here
Want to make a sundial? You can use this free software or download the current version here
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