Astro-Japanese philosophy, or Japanese Astronism, or also known as Keihatsu, refers to the presence of Astronism in Japan under management and philosophical jurisdiction of The Institution of The Philosophy of Millettism for Japan, a national subsidiary for the worldwide Astronist Institution. The Institution of the Philosophy of Millettism for Japan oversees the construction and maintenance of observatories and planetariums throughout its jurisdiction. Japan is split into forty-seven prefectures and is set to hold one Grand Observatory in the capital city of Tokyo. 

This national branch of The Institution of The Philosophy of Millettism manages the official representation and depiction of Astronism throughout this territory, including efforts to protect the identity of the philosophy with the intention of further disseminating it throughout the territory. It is The Institution alone that is granted the status of proprietor to the philosophy in this territory 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 Japan

Astronism is not recognised as a religion in Japan and the Demographics of Astronism report that is published annually by the Astronist Institution claimed there were 5,000 Japanese Astronists in late 2019. The situation of Astronist religious freedom in Japan has been designated as apathetic by the 2020 Astronist Freedom report meaning that although Astronists are not recognised as a religious group, they are free to publicly profess their faith.