| Johann Julius Friedrich Berkowski Solar eclipse [taken at the Royal Observatory in Königsberg, Prussia (now Kalinigrad in Russia)] 1851, 28 July Daguerreotype Creative Commons - Wikipedia LL/57566 A small 6-cm refracting telescope was attached to the 15.8-cm Fraunhofer heliometer and a 84-second exposure was taken shortly after the beginning of totality.
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