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On the solar solstice, we know that the earth is tilted towards the sun by 23.5°, making a solar zenith angle of 66.5°. cos(66.5°) = 0.4, so FPSS = 545 Wm-2. Interestingly, the pole gets more sunlight on its maximum insolation day than the Equator does on its maximum insolation day. ................
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