On what date was Brazil's current 27-star flag version adopted?

Brazil's current 27-star flag version was adopted on 11 May 1992. The change updated the celestial globe after Brazil created four new states: Amapá, Roraima, Rondônia and Tocantins. Their stars brought the total from 23 to 27, matching Brazil's 26 states and Federal District.

Brazil's flag was first adopted on 19 November 1889, shortly after the republic replaced the monarchy. Its green field and yellow diamond were retained from the imperial flag, while the imperial coat of arms was replaced with a blue starry globe and the motto “Ordem e Progresso.”

The dates in the other options refer to important moments in Brazilian history or flag legislation, but not the current 27-star design. The 19 November 1889 date belongs to the original republican flag, while 1 September 1971 refers to a law defining the flag's official construction and details.