The national flag of Brazil (Portuguese: Bandeira do Brasil) is a blue disc depicting a starry sky spanned by a curved band inscribed with the national motto, within a yellow rhombus, on a green field.
Brazil officially adopted this design for its national flag on November 19, 1889, replacing the flag of the second Empire of Brazil. The concept was the work of Raimundo Teixeira Mendes, with the collaboration of Miguel Lemos, Manuel Pereira Reis and Décio Villares.
The green field and the yellow rhombus from the previous imperial flag were preserved – the green and yellow colors representing the Braganza-Habsburg dynasty. A blue circle with 27 white five-pointed stars replaced the arms of the Empire of Brazil. The stars, whose position in the flag reflect the sky over Rio de Janeiro on November 15, 1889, represent the union’s federated units – each star representing a specific state. The motto “Ordem e Progresso” (“Order and Progress”) is inspired by Auguste Comte’s motto of positivism: “L’amour pour principe et l’ordre pour base; le progrès pour but” (“Love as a principle and order as the basis; progress as the goal”). Wikipedia