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The Polish version of the article was published in Roczniki Humanistyczne vol. 59, issue 2 (2011). The provisions of the Union of Brest guaranteed the use of the Julian calendar in the Uniate Church. In the second half of the 18th century, as a result of the socio-political changes and the so-called reduction in holidays in the Latin Church the question of a reformed calendar was brought up among...
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