Relationships to numerous other sites were checked and the above relationships noted do not exceed the number that might be expected due to chance. And, excepting Tikal and the distance to Boyne Valley, the results do not fit the pattern of relationships observed for other monuments. Additionally, the Miami River Circle does not fit the class of the other major monuments considered, large mounds and earthworks that remain visible place marks in the landscape for many millenia. Therefore, there was little expectation that these should have site to site relationships with the Miami River Circle. Suggested Further Study.
Some obvious questions come to mind.
If the Miami River Circle was created to monumentalize astronomical knowledge, it was done with amazing accuracy. If not, the probability of such exactive coincidence is also amazing. Accurate astronomical knowledge is evidenced elsewhere for the era considered. It is therefore not surprising, at least to me, to find this inference of accurate astronomy in another cultures during approximately the same period. Precise knowledge of the number of days per year and earth rotations per lunar orbit can be accomplished by counting or keeping records for a long period of time.