Αποτελέσματα Αναζήτησης
1 ημέρα πριν · 1870s. 1874 - In 1874, Jules Janssen made several practice discs for the recording of the passage of Venus with his series Passage de Vénus, which he intended to record with his photographic revolver.He used a model of the planet and a light source standing in for the Sun.While actual recordings of the passage of Venus have not been located, some practice discs survived and the images of one ...
