 Archaeocryptologists then can use different mathematical formulas to find correlations within that which is being studied or between other monuments or structures that share any underlying factors.Popular examples are the Orion correlation theory  between the Giza pyramid complex and the three middle stars of the constellation Orion, and also theories about the region of Cydonia on Mars.The coining of the word "archaeocryptography" is often attributed to Carl P. Munck, who after retiring from the United States military in the late 1970s began studying cartographic material, among other topics, trying to search for better answers as to why certain megalithic monument exist.