how do we know that our earth is round?
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As we see or earth from sattelite and also it is discoverd from many million years ago
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The earliest documented mention of the spherical Earth concept dates from around the 5th century BC, when it appears in the writings of Greek philosophers.[1][2] In the 3rd century BC, Hellenistic astronomy established the roughly spherical shape of the Earth as a physical fact and calculated the Earth's circumference. This knowledge was gradually adopted throughout the Old World during Late Antiquity and the Middle Ages.[3][4][5][6] A practical demonstration of Earth's sphericity was achieved by Ferdinand Magellan and Juan Sebastián Elcano's circumnavigation (1519–1522).[7]
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