There is a long time discussion between scientists and theorists about earth being flat.
How as an individual can I know if the Earth is a sphere or a flat disc?
What experiment can I do that doesn't involve trusting information from a 3rd party that would prove what the geometry really is?
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Look at the shadows across the moon. You can see the rounded shadows of moon in front of the sun and the earth in front of the moon during eclipses.
Also, gravity.
Also, Eratosthenes (father of geography) approximated the circumference of the earth several hundred years after smart people knew the earth was spherical.
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Compare observed curvature to reality. Binoculars, a clear day, and a stretch of flat land or ocean are all you need.