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Neptune was discovered firstly, of all things, by mathematics. Its theoretical existence was proven slightly after the discovery of Uranus in 1781. John Couch Adams of Britain and Urbain Jean Joseph Leverrier of France used mathematics to show that a gravitational pull from another object in space was affecting Uranus's orbit. They figured out not only where the planet was, but also how much mass it had.
65 years later, in 1846, a young German astronomer named Johann Galle used John Couch Adams's and Jean Joseph Leverrier's observations about where Neptune should be, and aimed his telescope there. That night, Galle discovered the 8th planet in the solar system. Shortly after, Neptune's largest moon, Triton, was discovered.
Altogether, it was a joint effort from these 3 countries to find out where (and what) Neptune was.
65 years later, in 1846, a young German astronomer named Johann Galle used John Couch Adams's and Jean Joseph Leverrier's observations about where Neptune should be, and aimed his telescope there. That night, Galle discovered the 8th planet in the solar system. Shortly after, Neptune's largest moon, Triton, was discovered.
Altogether, it was a joint effort from these 3 countries to find out where (and what) Neptune was.