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I’m a little hazy as to the origin of the 72 minute zman. Yerushayim is roughly as far south as Savannah Georgia. Clearly 3 kochavim beinonim are visible long before 72 minutes and Maran must have known that, living as he did in Tsfas. As I recall, the length of bein hashmashos is related to the time it takes to walk a specific distance. I don’t remember if it was a mil or a parsang. Can anyone lend some clarity to this?