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xkcd #3253: Sunbeam
(imgs.xkcd.com)
Title text:
While weather control is typically thought of as a superpower, the unconscious ability of astronomers and astrophotographers to summon clouds is more properly classified as a curse.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3253/
Because the average person has no reason to always keep track of the sun and their orientation related to it.