What is the main purpose of this passage?

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MCAT Critical Analysis and Reasoning Skills: Passage 16 — practice the complete quiz, review flashcards, or try a random question.

Use the following passage to answer questions: (1) The first glimpse we have that the Greeks possessed an idea of the shape of the earth comes from the poems of Homer. These poems show an intimate knowledge of Northern Greece and of the western coasts of Asia Minor, some acquaintance with Egypt, Cyprus, and Sicily; but all the rest, even of the Eastern Mediterranean, is only vaguely conceived by their author. Where he does not know he imagines, and some of his imaginings have had a most important influence upon the progress of geographical knowledge. Thus he conceives of the world as being a... Show more

What is the main purpose of this passage?