This chapter deals with the assumption that the Earth's motion (translation) despite the accelerated moving Sun is a uniform one. In that case, it must actually be assumed that the movement (translation) of the Earth is a hybrid one, both uniform (because of our perception) and accelerated (because of the accelerated movement of the Sun).

 

This is an important axiom in the ancient Theory of the Elements.

Therefore, just a brief explanation to indicate that this assumption can very well be the starting point of a deductive science.

 
About 300 BCE the Greek philosopher Euclid defined an axiom as being something naturally true in the world, something that does not require justification:

"Axioms do not need justification because they are obviously true statements about the world."

 
An axiom is therefore a proofless statement that that is accepted as a maxim. An axiom itself serves as the basis of evidence of other propositions. (Rienk Jonker)

 

Continue to: 2.5.1. Motion of the Earth is hybrid

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