Craters Hahn Origin of the name Friedrich von; German astronomer (1741-1805); Otto; German chemist (1879-1968). When to observe it … Nearby Berosus 114 km Gauss 201 km Seneca 215 km Plutarch 259 km Mare Anguis 312 km Eimmart 322 km Bernoulli 347 km Beals 372 km