The animated photo below provides a closer look yet at the quite precise golden ratio rectangle that appear in the design work above the columns. This, probably more than any other single feature of the Parthenon, provides rather compelling evidence that the Greeks knew of, and applied, the golden ratio in the construction of the Parthenon.
The photo below illustrates how this section of the Parthenon would have been constructed if other common ratios of 2/3’s or 3/5’s had been intended to be represented by its designers rather than the golden ratio: