In the pictures of the Alinari Archive and the Arcetri Astrophisical Observatory
Very rare and hitherto unpublished materials document the history of photography as applied to the study of the sky. The photographic instrument constitutes an essential, even revolutionary, moment in the study of astronomy, precisely as in that of all the true branches of scientific research. Today, it actually appears difficult even to imagine a valid scientific work without the aid of photography. The volume documents exactly how the history of photography became caught up in modern astronomical studies and has involved techniques and means that, in numerous cases, has made it possible to "stop", in their future, natural phenomena that otherwise would be almost elusive.