First photographed total solar eclipse

Background. Prior to 1851, no properly exposed photograph of the solar corona had been produced. The development of photography in the first half of the nineteenth century made recording a still image of the Sun during a total eclipse theoretically possible. However, the extreme contrast between the corona and the dark shadow of the Moon, along with the unusual orientation required for equipment, posed unique challenges for early photographers.

Observation and Capture. The Royal Prussian Observatory at Königsberg commissioned Johann Julius Friedrich Berkowski, one of the city's most skilled daguerreotypists, to record the event. The resulting daguerreotype is recognized as the first correctly exposed eclipse photograph of the solar corona. This achievement established the first accurate photographic image of a solar eclipse, providing the earliest scientifically useful visual record of such an event.

Astronomical Context. The eclipse occurred on Monday, July 28, 1851, with a magnitude of 1.0577. It took place at the Moon's ascending node, approximately 1.5 days before perigee, resulting in a larger apparent diameter for the Moon. Totality occurred in a narrow path across Earth's surface, while partial eclipses were visible over a surrounding region thousands of kilometres wide.