Penrose, Francis: An investigation of the principles of Athenian architecture: or the results of a recent survey conducted chiefly with reference to the optical refinements exhibited in the construction of the ancient buildings at Athens (London [u.a.], 1888)

8 AN INVESTIGATION OF THE PRINCIPLES OF ATHENIAN ARCHITECTURE

The bearings of the principal buildings, as derived from astronomical observations, areas follows:—
viz. to a spectator looking east—

The Parthenon axis

That of the Propylaea

The Erechtheum .

The Cecropium

Pedestal of Minerva Promachus

12° 52' 41'"-]

12° 31' 28''

4° 5°' 38'

9° 5' o'

24° 54' 27'

North of due east.

1 The difference between this bearing as derived from the east end and from the north flank amounted only to 0° i' 18", showing the extreme
accuracy to which the rectangle had been worked out.