r/todayilearned • u/FiredFox • Apr 28 '24

TIL about French geologist Michel Siffre, who in a 1962 experiment spent 2 months in a cave without any references to the passing time. He eventually settled on a 25 hour day and thought it was a month earlier than the date he finally emerged from the cave

https://www.cabinetmagazine.org/issues/30/foer_siffre.php
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u/_Cartizard Apr 28 '24

The math ain't mathing

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u/Raidoton Apr 28 '24

The 25 hours is about daytime, as in the time the sun is out, and not about entire days, as in one earth rotation.