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1. xattt · 1790112634 · focus · HN ↗

   I am curious if anyone else can tell whether it is a high UV day just by looking outside.

   There is a certain look to the sky (slightly whiter-bluer) looking against the clouds, and I am not sure if it is because I am directly seeing UV, whether there is some fluorescence, or whether it’s placebo effect.

   1. the__alchemist · 1790115951 · focus · HN ↗

      You can use simple heuristics to get a very good idea.

      1: How high in the sky is the sun? (Many other factors like time of year, time of day, and latitude feed into this) 2: What is the chance for you at a given time of the sun being blocked by clouds, buildings, etc?

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