EN
The authoresses of the article present their momentous discovery, which permit to accurately establish the exact day of Chopin's arrival in Paris after 150 years of confusion surrounding this topic. The research in the archives of Parisian 'Préfecture de police', combined with new data brought to light in studies of other Chopin biography scholars, such as Henryk F. Nowaczyk, Zbigniew Skowron, and confronted with historical facts corresponding with Chopin's journey to Paris, allows to define precisely the dates of this important moment in the composer's life.