L. L. Zamenhof his honour. In 1959, Unesco honoured Zamenhof in the occasion of his centenary. In 2015 Unesco decided to support the celebration of the 100th anniversary of the death of Ludwik Zamenhof. Zamenhof was 12 times nominated for the Nobel Peace Prize. His birthday, 15 December, is celebrated annually as Zamenhof Day by users of Esperanto. On 15 December 2009, Esperanto's green-starred flag flew on the Google search web page, in a commemorative Google Doodle to mark Zamenhof's 150th birthday. The house of the Zamenhof family, dedicated to Ludwik Zamenhof, and the Białystok Esperanto Centre, are sites of the Jewish Heritage
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