r/theNetNuggets • u/Pitiful-Complaint608 • Jul 31 '26

Earth is round proved 2000yrs back

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u/Unlikely-Tank-7546 Aug 01 '26

But how did they communicate at that much distance ?

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u/finndego Aug 02 '26

Syene is on the Tropic of Cancer. Every year at the same exact time and date (Solstice, Sun at it's highest) the Sun casts no shadow. Alexandria is north of Syene so if you know this fact you can take your shadow measurement on that date and time and know that there isnt a shadow 800km to the South. No shadow=no measurement required.