Neptune was the first planet to be discovered not by the naked eye or by randomly searching the night sky; rather it was predicted to exist in a particular position in the sky by mathematical calculations. The calculations were sent from French mathematician Urbain Joseph Le Verrier to Johann Gottfried Galle at the Berlin Observatory and in 1846 Neptune was discovered by telescope based on the predicted position.
#AstronomyL How far is #Neptune from Earth? The distance from one planet to another is constantly shifting because both bodies are moving through space. When Neptune and Earth line up on the same side of the sun, at their closest, they are only 2.7 billion miles (4.3 billon kilometers) apart. But when the planets are on opposite sides of the sun, they can put as many as 2.9 billion miles (4.7 billion km) between them.