The work of Ernest McClain (see ernestmcclain.net) is based upon a technique in which ever higher numbers appear to have been studied in antiquity as to the harmonic field of intervals possible within their integer limits. Such a single number reference can be mentioned en passant within texts like The Bible, Homer's Illiad or the Sumerian story of Gilgamesh and be ignored today as a frivolous use of large numbers, such as great ages of the gods, the number of ships, or tithe goods and so on, when in fact the numbers were referring to a musicological field relevant to the narrative and its elements.

McClain's work was very briefly introduced in my latest book Precessional Time and the Evolution of Consciousness in Chapter 3 on the Age of Aries when such activities seem to have replaced the megalithic activities in Age of Taurus.

Ernest has one of the finest sensibilities for Ancient Near East or A.N.E., science and symbolism and through recent email exchanges I wanted to be able to generate his tonal diagrams for myself to both learn more and answer specific questions. I was able to use some "resting" computer skills to make a web page so that people like myself could enter his world of tonal yantras (that look like mountains) and their corresponding tonal mandalas without having to learn the method of "limiting the products of powers of three and five and then doubling all numbers to the limiting number". This Harmonic Explorer page enables ridiculous freedom over previously required manual calculations, including walking through limiting number space in automation mode, or multiplying/dividing by 2, 3, 5, 10 or 12. It can be very useful for screen grabbing if discussing a given tuning system as in:

TRY IT NOW HERE: Harmonic Explorer

Ernest's website has study pdf's and other resources