Where is there literature that gives a geometric method for finding center of m in general?

I have recently in the past few years discovered independently, a geometric method for finding the center of m up to three dimensional multiple polyhedra xor spheres separated in space. I've had contact with Caltech and M.A.A. regarding these matters, but I'm getting mixed messages as to whether my method is new and different than that of Archimedes. Contributions I've made are utilizing prime factorization to make the construction of centroids simpler. I've also constructed the centroids of up to 13^3 points. Is this a world record? Guinness declined my application, so I don't know if there's a scientific world records database. My article was also declined by MathMag who's editor said to me in an email, "... this is already well known and doented in the litterature." I emailed back asking where the literature is. The response was, "... I can't source any literature, but it's there." The Caltech professor also said to me on the phone, "... we recognize your method is new and different than Archimedes, but we don't think it's an important contribution." I was also told earlier by the same Professor, "... factorization never came up in our discussions, but it is a nice touch though." Also, "... we're writing a book and we're going to mention your work in the chapter on centroids." I've also seen conflicting information on the web saying "these constructions are thought to be impossible" and "no such method exists". Can someone who has expertise please help me settle this matter? I'm sorry, but I feel I'm being railroaded and ignored by the professional Mathematics authorities and I really don't know why. Thank you in advance. The site I'll give is my personal website that has just some Mathematics I've done, some of which are still incomplete. http://www.bqllpd.com