Commemoration in Esperanto culture
Esperanto Day is a worldwide observance on 26 July, which celebrates the publication of Unua Libro, the first book in the Esperanto language, by the language's creator, L. L. Zamenhof on this day in 1887. According to the Universal Esperanto Association, Esperanto Day is "a day of linguistic justice and therefore of just and fair relations among ethnic groups, cultures, and peoples". As Esperanto is a constructed language with a specific date of inception, enthusiasts and speakers of the language celebrate it on this day, and also celebrate the ideas often associated with Esperanto, such as international cooperation and brotherhood, and the breaching of cultural divides.