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andi999
on Dec 1, 2020
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Vitamin D insufficiency may account for almost 90%...
What is the correct angle?
jwilk
on Dec 1, 2020
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[–]
https://en.wikipedia.org/wiki/Effect_of_Sun_angle_on_climate
dxdm
on Dec 1, 2020
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Closer to π/2 than not. ;)
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