This article deals with assessing the differences between thevalues of the shading factors for windows with overhangs calculatedunder extraterrestrial and terrestrial conditions. It has been shownthat the shading factor can be estimated under terrestrial conditionsemploying the available algorithms for the monthly average daily tiltfactor for beam radiation. The present results have been validated bycomparing with the values obtained by hour-by-hour calculationsemploying solar radiation data. The shading factor values evaluatedunder terrestrial conditions can differ by 25/100 compared to theextraterrestrial value for non-south facing windows shaded byoverhangs.
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