The observable effect is true, but I don't think it squares. Circles below the c... | Hacker News

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		shmeeed on Jan 31, 2024 \| parent \| context \| favorite \| on: Why flying insects gather at artificial light The observable effect is true, but I don't think it squares. Circles below the ceiling in the middle of the room aren't perpendicular to the window as a light source. I see this mostly with one particular type of fly that just loves going around light fixtures, maybe they're sensitive to the EM spectrum rather than visible light?

scotty79 on Feb 13, 2024 [–]

I think flies might use both sky and gravity for navigation and when sky is not up it messes with them and results in circles.

I don't think those circles are exactly perpendicular to the vertical direction. I think most of them are skewed.

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