If you don't believe the world is round, it may be challenging to convince you through a single piece of evidence or proof. However, there is a wealth of scientific evidence and observations that support the round shape of the Earth. Here are a few methods and evidence that have historically been used to demonstrate the Earth's roundness:
Astronomical observations: Throughout history, people have observed celestial phenomena that provide evidence for the Earth's round shape. For instance, during a lunar eclipse, the Earth casts a curved shadow on the Moon, which is always round. Additionally, the way stars and constellations appear to move in the sky as one travels from one hemisphere to another suggests a curved Earth.
Photos from space: Images of Earth taken from space by astronauts and satellites provide clear visual evidence of its round shape. These photographs show a distinct spherical appearance of our planet when viewed from space, with a curved horizon.
Circumnavigation: The ability to circumnavigate the Earth by traveling in a straight path and eventually returning to the starting point is consistent with a round Earth. Mariners have been using this method for centuries, and it is based on the assumption that the Earth is round.
Gravity and its effects: The force of gravity acts toward the center of mass of an object, resulting in a spherical shape for celestial bodies of sufficient mass. The distribution of gravity around the Earth, as observed through measurements and gravitational models, also supports its roundness.
Earth's curvature over large distances: Over long distances, such as when looking at the horizon from an elevated position, the curvature of the Earth becomes visible. For example, ships appearing on the horizon first become visible from the top of their masts, gradually revealing more of the vessel as it approaches.
Geodetic surveys and measurements: Geodetic measurements, such as those conducted by surveyors and geodesists, involve the precise measurement of Earth's shape and curvature. These measurements have consistently shown Earth's roundness.
While these are just a few examples, there is a vast body of scientific evidence that supports the round shape of the Earth. It's important to approach scientific evidence with an open mind and critically evaluate the available data and research.