this is stupid. something about activation energy? are there any activation energy hacks?

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[–] 1 point 2 years ago (3 children)

Still I don't understand does shadows have something to do with vitamin D ?

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  • [–] 12 points 2 years ago (1 child)

    No. It means how high is the sun.

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  • [–] 7 points 2 years ago

    A shallow angle from the sun give you that long shadow, but it also gives the light lots of extra air to pass through sideways on it's way down out of space. The extra air filters out more light, and without an intense enough light your skin won't make Vitamin D.

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  • [–] 3 points 2 years ago

    If you have a long shadow, the sunlight that gets to you has gone through much more atmosphere which attenuates the ultraviolet light. So at high/low lattitudes and during morning/evening hours the amount of uv that gets to the surface is much lower.

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