According to our modern timekeeping system, utilized in nautical mile mapping, there are 86,400 seconds per day, four times the number of nautical miles which compose the circumference length of the earth, 21,600, which in turn is half the number of Great Pyramid of Giza base perimeter lengths which compose the circumference length of the earth, 43,200, so what’s the connection? The clear connection, demonstrably, is timekeeping, the ancients could measure the earth as we do, with geometry by timekeeping, but they measured precession time, the rate that the earth wobbles, 72 years/degree, not solar transit time, which was not accurately achieved until the invention of Harrision’s Chronometer (named after Chronos) in the 1750’s.
Charles Hapgood pondered, in his classic book Maps of the Ancient Sea Kings, how the ancients could accurately navigate and map much of the world during the Ice Age, as they did, according to the source maps cited on medieval maps which show Antarctica and South America, their coastlines accurately, continents supposedly not known to exist in medieval times, but there they are on those maps, on the maps of Piri Reis and Oronteus Finaeus (noted in Hapgood’s book), along with other maps which indicate a fantastic ability by the ancients to accurately measure time, what is needed to precisely calculate east-west distances.
The answer is explained in article #2 at http://IceAgeCivilizations.com, the same methodology utilized to survey the dimensions of the Great Pyramid of Giza, whose base perimeter length is exactly half a nautical mile, but based on precession time measurement, as manifested by the apparent movement of the stars because of the slow wobble of the earth’s axis, at the rate of 72 years/degree, perfect for hexagon geometry, the basis of circular geometry, the matrix for our modern nautical mile mapping system, which (utilizing solar time) allows us to accurately determine longitude.
The ancient greek foot length was 1/3,000th of the base perimeter length of the Great Pyramid of Giza, and the royal cubit length, also earth commensurate (as explained in the link), was a common unit of measure for sacred buildings in the ancient world too, so it’s obvious that the ancient units of measures, whose lengths became variable through the millennia, were initially and precisely subdivisions of the radius length of the earth. This enabled maritime powers such as of Atlantis which went under actually circa 1500 B.C. (see category Atlantis Revealed) to confidently navigate to far-flung locales in search of mineral riches, mapping much of the world in the process, evidenced with the Maps of the Ancient Sea Kings, and much other archaeological evidence for global navigation by the navigators of the Ice Age, which ended actually much later than is popularly advertised.