What is the solar irradiation at the earth surface


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Q: On an overcast day the directional distribution of the solar radiation incident on the earth's surface may be approximated by an expression of the form Ii= In cosθ , where In 80 W/m2 sr is the total intensity of radiation directed normal to the surface and θis the zenith angle. What is the solar irradiation at the earth's surface?

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Electrical Engineering: What is the solar irradiation at the earth surface
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