Think about whether circumnavigation can be considered rigorous proof of the sphericity of the Earth?

Magellan’s round-the-world voyage can be considered a strict proof of the sphericity of the Earth, since after its voyage there is no doubt that the Earth is spherical, and all the oceans are interconnected

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.