As we know that the people used to believe that the Earth is flat before the invention of telescopes or rockets.
But there used to be a civilization that belived that the Earth is round even before the invention of any telescopes or space crafts. The civilization is the greek civilization. This was ingenious. The main concept they used to open there intuition on the finding of the spherical shape of earth is by looking the horizon(the spot where it seems the sky and the land are joint.). The ships with the cargo when go for international shipping after covering certain distance as they used to reach closer to the horizon and they just disappeared afterwards.
From this observation, the greeks perceived that the earth is spherical because the ship that seemed disspeared was actually moving on a constant curved and eventually reached on the other hemisphere.
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