Submitted by Ice_Ice_Fetus t3_11drtwn in explainlikeimfive
wayne0004 t1_jaasx42 wrote
Hipparcus proposed using the local time a lunar eclipse happened to calculate the longitude of a place. So, at least from Ancient Greece. I don't know how extended this knowledge was, though.
agate_ t1_jaaz10i wrote
Finally a good answer!
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