The angle of the sun is vital, which is affected by time of day, time of year, a... | Hacker News

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		drivers99 on May 11, 2023 \| parent \| context \| favorite \| on: Place mushrooms in sunlight to get your vitamin D ... The angle of the sun is vital, which is affected by time of day, time of year, and your latitude. This is a chart showing time of day and year on the UV index, for a given latitude (NYC so about 41°N) https://www.grassrootshealth.net/wp-content/uploads/2019/05/... (PDF)

YellOh on May 11, 2023 | [–]

The rule of thumb I've heard is that you make vitamin D iff your shadow's height <= your height.

andreasscherman on May 11, 2023 | [–]

Wrote below as well, but seems relevant: https://whencanigetvitamind.com

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