Today marks the day that the planet Neptune has gone around the Sun one complete time since it was first discovered. The length of a Neptunian year is 164.79 Earth years, and when it was discovered on September 23 1846, it was a big fucking deal, since it was the first planet to be discovered mathematically before it was seen directly.
John Adams and Urbain Le Verrier separately calculated that the orbit of Uranus was being affected by the gravitation pull of another planet, leading them both to mathematically discover the icy Neptune.
