Astro-Montserratian philosophy, also known as Montserratian Astronism, as part of the larger British Astronism denomination, refers to the presence of Astronism in Montserrat. This territory is under management and philosophical jurisdiction of The Institution of The Philosophy of Millettism for Montserrat, 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 Montserrat oversees the construction and maintenance of observatories and planetariums throughout its jurisdiction. Montserrat is split into three parishes and is set to hold one Grand Observatory, which will also be the only Astronist observatory in this British Overseas Territory. 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 Montserrat.