Galle, Johann Gottfried (1812–1910)
Johann Galle was a German astronomer who, with Heinrich Louis d'Arrest,
made the first observation of Neptune (1846)
based on calculations by Leverrier. Though
Galle was the first to observe Neptune, its discovery is usually credited
to John Adams (who made an earlier calculation)
and Leverrier. Galle also discovered the crêpe ring of Saturn (1838) and suggested a method for determining the scale of the Solar System
based on the observation of asteroids.