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The original was posted on /r/todayilearned by /u/EveryDollarVotes on 2025-09-09 16:26:23+00:00.

Original Title: TIL Before the invention of the mechanical clock, for many, the length of an hour varied by latitude and season. The day was always 12 hours long, so in the summer hours grew “longer” and in the winter they grew “short.”