The First Image of the Sun
The technology of daguerreotype photography was in full glory on April 2nd, 1845, when the first image of the sun was taken. The image was captured by Leon Foucault and Louis Fizeau, who were both French physicists, and it is one of the oldest recorded.
The First Photograph Capturing an Amputation
This image was captured on April 18th, 1847, and shows Sargent Antonio Bustos getting his leg amputated. The amputation was performed by Pedro Vander Linden, who was a Belgian surgeon and was reportedly done during the Mexican-American War while on the battlefield.