by Ernest R. Evans
This photo shows Neptune very close to its "Discovery Position" of Sept. 23/24, 1846 at the Berlin Observatory. Its position, calculated by Urbain Le Verrier, and sent by post to Johann Galle of the Berlin Observatory, resulted in Galle receiving permission from the observatory's director, Johann Encke, to search for the purported planet. Within an hour of starting the search, Galle and his assistant, Heinrich d'Arrest, spotted the planet now known as Neptune!
For "erect" view of photo, "flip" downloaded image horizontally; for a Newtonian view, flip image vertically.