Zamenhof Day Zamenhof Day Zamenhof Day (), also called Esperanto Book Day, is celebrated on 15 December, the birthday of Esperanto creator L. L. Zamenhof. It is the most widely celebrated day in Esperanto culture. On this day, Esperantists hold information sessions and cultural gatherings to promote literature in Esperanto. The history of celebrating Esperanto on Zamenhof's birthday can be traced back to 17 December 1878, when at a birthday party for his 19th birthday he presented to his friends his "Lingwe uniwersala", the first version of his international language. By 1887, this language had evolved into what is now recognized as
Orgelbrand's Universal Encyclopedia (1859) the first edition of the years (1872-1876, 1877-1879, 1883-1884, 1898-1904) had a volume-reduced form. In 1984-1985, a reprint of the original version was published in Poland. The creators of the publication's content were many representatives of the Polish nineteenth-century intelligentsia. In entry to the first volume published in 1859, a list of authors of the encyclopedia has been published. It contained the following names: Adam Adamowicz, Jerzy Alexandrowicz, Władysław Ludwik Anczyc, Michał Baliński, Jan Baranowski, Sadok Barącz, Adam Bartoszewicz, Julian Bartoszewicz, Władysław Bentkowski, Feliks Berdau, Leopold Berkiewicz, Cezary Biernacki, Julian Bleszyński, Kazimierz Bujnicki, Ignacy Chodźko, Teofil Cichocki, Wojciech Cybulski, Wincenty