December 15th is Zamenhof Day.
This is the day of Polish ophthalmologist and linguist, Lazaro Zamenhof.
On this day in 1859, he was born in Bialystok, Poland.
In 1887, at the age of 27, he announced the invention of the international language “Esperanto”.
Esperanto is an artificial language created as the common language to all human beings, and has been widely known so far.
Every December 15th, commemorative events are held around the world.