4. Calculate the angel of incidence at 10:30 a.m. EST on July 21 for 36 deg N latitude and 78 deg W longitude for (a a horizontal surface, (b) a surface facing southeast, and (c) a surface inclined 40 deg from the vertical and faci south. Answers: (a) e = 28.2 (b) 0 = 63.5 (c) 0 = 43.6* %3D %3D

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