The goal of Štefánik's work was Paris. He arrived here on November 28, 1904. Beginning On April 1905, Professor Janssen came to Paris. Štefánik got to him, also to his observatory in Meudone. Janssen was attracted by Štefánik. Štefánik did business as a guest at the Meudon Observatory various expeditions (eg 20 June 1905 ascent to the observatory at the top of Mont Blanc, or On August 30, he observed a total solar eclipse in Alcosebra, Spain.