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[–] 3 points 2 years ago (1 child)

Actually every 463 meters.

40 075km is circumference of Earth. There are 24x60x60 seconds in a day.

40 075×1 000÷(24×60 ×60) =~ 463.8

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  • [–] 8 points 2 years ago (1 child)

    Wouldn't it depend on latitude? It would be much less than 463 metres at the latitudes of Europe

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  • [–] 1 point 2 years ago* (last edited 2 years ago)

    Yes, distance of 1" on equator (463.8 m) × cosine of latitude longitude. This means approximately 350 m in Rome, 285,6 m in Berlin and 232 m in Helsinki. In reality a bit less, as I didn't take the ellipsoid shape of the globe into account.

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