| Caption | “System centred at Ammonium” (from Richer 1989, see text). Four omphaloi are envisaged by Richer (ibidem), centred, respectively, at Sardes, Delos, Delphi, and Ammonium. Sardes, Delos and Delphi are located on the vertices of an isosceles triangle. Similarly, also Sardes, Delphi and Ammonium are the vertices of another isosceles triangle. While it is reasonably easy to conceive how they afforded in getting the needed triangulations for the first such triangle (by means of line-of-sight measurements and fires during clear nights), it appears a mystery how they afforded in measuring the relative longitude of Delos and Ammonium. See text. |
