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 M⊕) in a highly eccentric retrograde 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 clustering of ETNO orbits by  alignment with P9. 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 the exploratory reconstruction of the comet's orbit observed in CE 60 for 180 days and documented in Chinese chronicles.Numerical modeling showed relative stability over a period of 1000,000 years.