Astro-Vatican philosophy, Vatican Astronism, or Catholic Astronism refers to the presence and history of Astronism in Vatican City State, as well as the relations between the Astronist Institution and the Roman Catholic Church, usually in the form of issues regarding the syncretism of both religions, resulting in the development of Astro-Catholicism. Astro-Catholicism and the relations between the Astronist Institution and the Roman Catholic Church are under exiled management and philosophical jurisdiction of The Institution of The Philosophy of Millettism for the Vatican City State and the Roman Catholic Church, a national subsidiary for the worldwide Astronist Institution. The Institution of the Philosophy of Millettism for the Vatican City State and the Roman Catholic Church conducts direct communications with the Holy See and various Catholic organisations in the discussion and dissemination of Astro-Catholic literatures, in the restoration of churches, and on other issues concerning the two entities for mutual benefit. This subsidiary of the Astronist Institution manages the official representation, depiction, and interactions on the side of Astronism with Roman Catholicism. It is The Institution alone that is granted the status of proprietor to Astronism as any other organisations or institutions proclaiming such a role are deemed as unauthorised proprietors and are therefore considered as part of the anti-Institutionist movement. History of Astronism in Vatican City. Astronism is not recognised as a valid or true religion by the Holy See and as a subsequence, it is not recognised by the wider Roman Catholic Church as of November 2019. Interfaith relations have been proposed by the Astronist Institution, but they have yet to be reciprocated by the Catholic Church. No Astronists reside in Vatican City.