a Pastoral letter, Encyclic, or Papal bull that is circulated between churches
a circular argument is a term for a type of logical fallacy where the very thing that is trying to be proved is assumed to be true. The historical term (due to a mistranslation) for this is Begging the question.
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Circular Quay is a locality in the City of Sydney, Australia, between Bennelong Point and The Rocks.
Circular Quay is a focal point for many community celebrations, for both its historic significance as the birthplace of the Australian nation, and for its proximity to the Sydney icons of the Sydney Opera House and the Sydney Harbour Bridge.
Circular Quay is also the home of Sydney's Museum of Contemporary Art and soon the City Library, in the historic Customs House.