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TheSkiGeek t1_jabkzg4 wrote on February 28, 2023 at 6:28 AM

Reply to comment by annomandaris in Eli5: How did people know how long a year was in olden times? by Slokkkk

Hard to tell when it’s exactly noon.

More reliable to mark where on the horizon the sun sets/rises each day. When the movement of that point stops and reverses, that’s either the winter or summer solstice.