AGFA photographic plates, 1880
The Seal of the USNO with a quote from the Astronomica by Marcus Manilius, Adde gubernandi studium: Pervenit in astra, et pontum caelo conjunxit [Increase the study of navigation: It arrives in the stars, and marries the sea with heaven.]
Mimosa Panchroma-Studio-Antihalo Panchromatic glass plates, 9 x 12cm, Mimosa A.-G. Dresden
Negative plate
The 26 inch (66 cm) aperture telescope, with which Asaph Hall discovered the moons of Mars in 1877; the telescope is shown here at its new location.
Image resulting from a glass plate negative showing Devil's Cascade in 1900.
Naval Observatory Flagstaff Station
Number One Observatory Circle, official home of the U.S. vice president.
Atomic clock ensemble at the U.S. Naval Observatory
Navy Precision Optical Interferometer, Flagstaff, Arizona

Pluto was discovered using photographic plates in a blink comparator; its moon Charon was discovered 48 years later in 1978 by U.S. Naval Observatory astronomer James W. Christy by carefully examining a bulge in Pluto's image on a photographic plate.

- Photographic plate

Relying strongly on photographic methods, the naval observers returned 350 photographic plates in 1874, and 1,380 measurable plates in 1882.

- United States Naval Observatory
AGFA photographic plates, 1880

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