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Hace 1 día · 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 ...
