This is another way to see the Earth, and it raises the idea that it is flat. This is by observing the "curvature" of the surface of the planet for a considerable period, depending on how much the Earth has complete flatness and the difference (average). A flat theory shows the surface completely out of the plane and its curvature is zero per mile. Actual Earth curvature is 0.000126 per mile (because it is not a perfect sphere), very close to 0 per mile, and certainly not readily measured by equipment used by antiquity people.
"Today, what is accepted as knowledge may be abandoned tomorrow." The above basically shows that the knowledge information that everyone recognizes today will change for change due to tomorrow. By decomposing and defining important words such as "knowledge", "sometimes", "acceptance", "abandonment", it helps to clearly understand sentences. "Knowledge" is defined as "experience, the facts gained through education, information, skills, subject matter theoretical or practical understanding" (Merriam, 2014).
Knowledge is accepted today and will be abandoned tomorrow because society is always mechanized. Somewhere in the world, new discoveries are taking place and we are creating new information on topics. Using the words discarded in the sentences does not necessarily mean that all previous knowledge has been abandoned and accepted a whole new idea. Evolutionism is the view that what we see about the world may be "tested and retested by future observations" (Wikipedia). As technology becomes more mechanized and access to information becomes easier, we can better understand. This is due not only to the advancement of technology but also to social trends and new discoveries around the world.