ALPO adopted a similar structure with sections like that of the British Astronomical Association (BAA) in order to properly study the objects observed.
In his retirement, Catts became secretary and treasurer of the New South Wales branch of the British Astronomical Association, devoting more time to his hobby of astronomy.
Brennan was a member of several scientific societies, including the British Astronomical Association, the Astronomical Society of the Pacific, the Astronomy and Astrophysical Society of America, the Saint Louis Academy of Science, the American Mathematical Society, and the National Geological Society.
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