Charles and his clan were in the City of London. At a certain location it was insisted that they were in the center of the Earth. Conceited, no? Londoners have a point.
Stand in the center of the City. Draw a circle about you at one meter. Draw another at two meters. Repeat twenty million times. You have constructed a 1:1 bulls-eye map of the world that contains the entire world in perfect circles with no missing space or extra terrain. Therefore you are in the center of the Earth. QED Of course this works for everyplace on the face of the Earth. If you look at latitude lines, every globe has already done this for the North Pole. If you are from New Zealand every globe has already done this for the South Pole. Just tilt the pole over your favorite location and you are done. Send two eagles in opposite directions at the antipodes and they will come to you at your omphalos.
Londoners have a point, but they’re wrong. The Omphalos is the Redwood in Palo Alto. The Omphalos is the Yogo Mine in Lewistown.