An Astronist association, or an association of Astronism, is an informal group or society for fellow Astronists to regularly meet up and discuss their beliefs, the latest news in the Astronist community and in wider space philosophy, and may involve a number of excursions and events organised by the group throughout the year. These groups are often in association with a national association that oversees their activities and with whom they are required to register in order to receive funding and resources. 

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Local Astronist associations are governed by these national associations which report to the Astronist Institution. Generally, each sovereign state is assigned a national Astronist association.