News This Day In History: Planet Neptune Published 11 years ago on September 23, 2014 By Deandrea S Hamilton German astronomer Johann Gottfried Galle discovered the planet Neptune; the year was 1846…. Also this day, in 1939 Sigmund Freud, the founder of psychoanalysis, died in London. Share this: Related Topics:johann gottfried galleneptune TRENDING News5 days ago Commonsense, Not Confrontation: Why Kamla Persad-Bissessar Is Right USA1 week ago $7M SNAP and Charity Food Scam: Two Haitians Charged in Massachusetts