Flat earthers often use a variety of arguments to try and refute these observations. Some of the most common arguments include:

- The horizon appears to be flat because our eyes have a limited range of vision: Flat earthers argue that the horizon appears to be at eye level because our eyes have a limited range of vision, and we cannot see the curvature of the earth.

- The appearance of ships at sea is due to perspective: Flat earthers argue that the disappearance of ships over the horizon is due to perspective, not the curvature of the earth. They claim that the ship is simply getting smaller and smaller until it disappears from view.

- High-altitude photos and videos are fake: Flat earthers often claim that photos and videos taken from high altitudes are fake, and that they have been doctored to make it appear as if the earth is curved.

- Lunar eclipses are caused by other celestial bodies: Flat earthers argue that lunar eclipses are not caused by the earth's shadow, but rather by other celestial bodies such as planets or stars.

- The Foucault Pendulum is a hoax: Flat earthers often claim that the Foucault Pendulum is a hoax, and that it does not actually demonstrate the earth's rotation.

- Gravity is not real: Flat earthers often argue that gravity is not a real force, and that objects are simply pushed down to the earth's surface by some other unknown force.

- Time zones are a human invention: Flat earthers argue that time zones are a human invention, and that they have nothing to do with the shape of the earth.

Overall, these arguments are not supported by scientific evidence and are often based on misunderstandings or misinterpretations of basic scientific principles.
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