Since Ptolemy was a mathematician he had made a more accurate explanation for pi, 3.1416. But soon people found that it wasn't equal to pi.
Why Does It Matter? How Did It Affect the World?
Why I think it matters is because Ptolemy was many things like a mathematician, astronomer so even if he was wrong he still had very smart theories. How I think Ptolemy's theories affected the world is that since people didn't know the real truth so they didn't think if Ptolemy was wrong.