Which sentence in this excerpt from Great Astronomers shows that Ptolemy’s theory was flawed, but that he was still the undisputed authority on astronomy for centuries?

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the cost of attendance or coa is an approximate budget for the cost of attendance of the whole academic year. in order to calculate this, universities take into consideration many factors like room and board, tuitions and fees, books, transportation and personal expenses such as medicine, laundry, clothing. all these factors combined make up the final sum to the cost of attendance in each university.