One year ago mankind first became aware of the planet Neptune. Well, one year ago Neptunian time - it was actually 164 Earth years. Today is the anniversary of that discovery… although interestingly not the anniversary of the first time we saw the planet. Says Wired:
Neptune was mathematically predicted before it was first telescopically observed on 24 September 1846. Astronomer Johann Gottfried Galle and his assistant Heinrich Louis d’Arrest used Urbain Le Verrier’s calculations to locate the planet. It was found to be within a single degree of where Le Verrier had predicted it would be and it was the first planet to have been discovered deliberately.
Today Neptune has completed one full orbit of the Sun, and is back in the exact position where it was mathematically predicted to be way back before the Civil War. Those Neptunians will be surprised at how much changes here on Earth in just one year.