The sun is at a lower angle from the horizon at higher latitudes. It passes thro... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

HPsquared 3 months ago | parent | context | favorite | on: The worthlessness of Vitamin D is mildly exaggerat...

The sun is at a lower angle from the horizon at higher latitudes. It passes through more atmosphere, losing some UV, and also the surface irradiance on the ground (energy per unit land area) is lower.

flossly 3 months ago [–]

This. What I've learned for VitD conversion in the skin the sun needs to be more than 45° "high". Below that it's not much effective.

Those long summer evenings in northern Europe are thus not all that useful for VitD.

Consider applying for YC's Winter 2027 batch! Applications are open till November 2.
Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact