Fact-Check Results:

The claim that Earth is flat is false. For over 2,000 years, observations and experiments—such as the way shadows fall differently at different latitudes, the curvature visible from high altitudes, and the circumnavigation of the globe—have proven Earth is a sphere. Today, satellites, space missions, and independent experiments (like laser gyroscopes and long-range photography) all confirm Earth's spherical shape. You can verify this yourself by observing ship hulls disappear over the horizon, tracking time zones, or even using a smartphone app to measure Earth's curvature during high-altitude flights.

https://www.nasa.gov/earth/how-do-we-know-the-earth-isnt-flat-we-asked-a-nasa-expert-episode-53/

https://askanearthspacescientist.asu.edu/top-question/flat-earth

https://www.space.com/how-to-debate-flat-earther

Confidence Level: 100%

Verdict: False

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