Note 268 — IS THE GREAT PYRAMID OF GIZEH A METROLOGICAL MONUMENT?
Reading edition
"The diameter of the earth, according to the measures taken at the Pyramids, is 41,666,667 English feet, or 500,000,000 inches." (See The Great Pyramid, p. 75.) "Dividing this number by 20,000,000 we obtain the measure of 25 (English) inches for the Sacred Cubit" (p. 67).