If you place a tetrahedron inside sphere, the two will intersect at exactly 19.47° latitude. In doing so, you divide the sphere into two thirds to one third, exactly. What is located on Earth at this latitude? - The pyramids of Teotihuacan in Mexico, Mauna-Kea, the largest volcano on the planet located on the Big Island of Hawaii (there are also bays on either side of the Big Island right at 19.47 degrees where the whales and dolphins like to give birth) plus Avebury Stone Circle in England. On