An arc second is the distance the sun travels relative to the surface of the earth in one second, that’s exactly one hundred feet when the olympic foot of 12.16 modern inches is used, the olympic foot a 1/6,000th subdivision of a nautical mile and a 1/3,000th subdivision of the base perimeter length of the Great Pyramid of Giza. The timekeeping used to calculate the length of the olympic foot (and the royal cubit of 20.63 modern inches) was by the axial precession rate of the earth’s axis, 72 years/degree, see Page at right Great Pyramid for Navigation for the full explanation.
