Evidence for Planet Nine with a 3,600-Year Period and 1 AU Perihelion as the Cause of Recurring Apocalypses.

A model of Planet Nine (P9) as a massive body (5-10 M⊕) in a highly eccentric orbit (e ≈ 0.994–0.996, q ≈ 1 AU, Q ≈ 400–500 AU, T ≈ 3600 yr), presumably captured from interstellar space. The model relies on the self-organized clustering of ETNO orbits in the region of least interaction with P9 after the initial chaotic dispersion. It also shows quasi-periodicity in climatic and cultural-historical markers (the Younger Dryas event, the Piora oscillation) consistent with a period of T ≈ 3600 yr. A historically confirmed possible observation of Planet Nine’s perihelion passage of 1 AU has been established, supported by reconstruction of the comet’s orbit observed in CE 60 for 180 days and documented in Chinese chronicles. Numerical simulations have shown relative orbital stability over a period of about 1000,000 years.