Are travel around the world proof of the sphericity of the Earth?

Travel around the world is proof of the closedness of the earth’s surface. Examples of closed surfaces: inner surface of a sphere, surfaces such as pear, cylinder, etc.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.