Water Level Demonstrates The Dip of the Horizon and Proves Earth’s Curvature

As the Earth is spherical, the horizon is below the eye-level (or the astronomical horizon). The angle between the eye-level and the horizon is the dip of the horizon. The angle becomes larger as we go higher.

Flat-Earthers often claim that “the horizon always rises to eye-level”, and thus ‘proving’ the flat Earth claim. Despite their insistence to use a water level to ‘prove’ water is flat, the same device can be used to demonstrate the dip of the horizon, proving the water surface has curvature, and consistent with the spherical Earth model.

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The Curvature of the Water Surface

Flat-Earthers mention the curvature of water a lot. According to them, the curve of the water can never be observed, and thus, the Earth is flat.

The problem with such an argument is that they usually conclude that from a very small amount of water. Water in a glass or a bucket will practically look flat. Not because there is no curvature due to Earth’s gravity, but because the water is in such small amount so that the curvature is minuscule and impossible to observe, let alone with the naked eye.

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Lake Pontchartrain Power Transmission Lines: Evidence of Earth’s Curvature

Lake Pontchartrain is a lake in Louisiana, United States. There are power transmission lines about 24.27 km (15 mi) across this lake. They are practically straight and each tower is uniform and has the same height, making these towers ideal for observing the curvature of the Earth.

They are first popularized by Soundly who presented evidence of Earth’s curvature using a series of photos and videos of the power lines in June 2017. As of now, the towers and other objects on the lake are probably the most popular Earth curvature tourism spot in the world.

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Water Surface and Communicating Vessels

If the Earth is round, and it pulls water to its surface; why a ball does not pull water, even though both are round?

Because gravity is not caused by the shape of an object. Gravity is caused by mass. Everything with mass have gravity. The larger the mass of an object, the greater its force of gravity.

The ball has much smaller mass than the Earth, it is not even close. Correspondingly, its gravity is also much smaller.

Besides, the experiment is obviously done in Earth environment. The Earth —that has much larger mass than the container of the water— has much bigger influence on the shape of the water surface, than the container itself.

The surface of the water will form a spherical shape, with the same center as the center of the Earth. As the center of the Earth is too far away, the curvature is not perceptible. According to our calculation, in a container 10 cm wide, the bulge of the curvature is only about 0.0000002 mm.

It is a very small bulge, and impossible to perceive. Other forces —like adhesion and cohesion— will have greater influence on water in such small container.