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A_Meal_of_Pain t1_jackbxl wrote on February 28, 2023 at 1:43 PM

Reply to comment by Ansuz07 in Eli5: How did people know how long a year was in olden times? by Slokkkk

And the tools necessary to make these measurements are very simple. Literally all you need is a stick in the ground and a few pebbles or something else to mark the longest shadow the stick casts each day.