Astro-British philosophy, also known as British Astronism, refers to the presence of Astronism in the United Kingdom of Great Britain and Northern Ireland. This country is under management and philosophical jurisdiction of The Institution of the Philosophy of Millettism for the United Kingdom of Great Britain and Northern Ireland, a national subsidiary for the worldwide Astronist Institution. The Institution of the Philosophy of Millettism for the United Kingdom of Great Britain and Northern Ireland oversees the construction and maintenance of observatories and planetariums throughout its jurisdiction. The United Kingdom is split into one-hundred counties and is set to hold one Grand Observatory in the city of Preston, and is also set to host the largest Astronist observatory in the world in the capital city of London called The People’s Grand World Eidouranium.  The United Kingdom also hosts four main denominations of Astronism in the kingdom, including Scottish Astronism, Northern Irish Astronism, Welsh Astronism, and English Astronism. The Institution of the Philosophy of Millettism for the United Kingdom of Great Britain and Northern Ireland is responsible for the administration of institutions of Astronism in the kingdom’s various overseas territories and dependencies. History of Astronism in the United Kingdom. Astronism holds its roots in the United Kingdom as the organised philosophy was founded there in the early 21st century by the British philosopher, Cometan, during the several years referred to as The Founding of Astronism. According to the 2019 Demographics of Astronism report published by the Astronist Institution, there were 146,000 Astronists living in the United Kingdom. Recognition of Astronism in the United Kingdom. As of November 2019, Astronism is not currently recognised as a religion by the government of the United Kingdom and therefore does not official governmental recognition or the associated benefits of such a recognition. Astronism in England. Astronism in Wales. Astronism in Northern Ireland. Astronism in Scotland. Astronism in the dependent territories of the United Kingdom. Astronism on the Isle of Man. Astro-Manx philosophy, or Manx Astronism refers to the presence of Astronism on the Isle of Man. This territory is under management and philosophical jurisdiction of The Institution of The Philosophy of Millettism for the Isle of Man, which is under authority of The Institution of The Philosophy of Millettism for the United Kingdom of Great Britain and Northern Ireland, a national subsidiary for the worldwide Astronist Institution. The Institution of the Philosophy of Millettism for the Isle of Man oversees the construction and maintenance of observatories and planetariums throughout its jurisdiction. Isle of Man is split into seventeen parishes and is set to hold one Grand Observatory in the capital city of Douglas.