0
This day in 1846, astronomer Johann Gottfried Galle became the first person ever to observe the planet Neptune, the existence of which had been mathematically predicted by Urbain-Jean-Joseph Le Verrier and John Couch Adams.
Still curious? Ask our experts.
Chat with our AI personalities
CoachSuccess isn't just about winning—it's about vision, patience, and playing the long game.
Chat with Coach
SteveKnowledge is a journey, you know? We'll get there.
Chat with Steve
RossEvery question is just a happy little opportunity.
Chat with RossAdd your answer:
Earn +20 ptsQ: What happened on 23rd September?
Write your answer...
Submit
Still have questions?
Continue Learning about World History
What happened on 2000?
september 15th olympics in Australia (sydney) :)
What happened in world history between 1991 and 2007?
September 11
What world events happened on September 12?
Ummmm...i think nothing really but on the day but on the day before that...september 11:(
What happened on September 9 1938?
Keith B was born and he is the best person in the world.
When does summer end in Russia?
Summer in Russia ends on the last day of summer, sep the 23. One of the reasons why school in Russia starts on 1st of September, the 23rd to last day of summer
Trending Questions
What is the original home of the Saxons?
What does the name Kamor mean?
Who is the father of Indian unrest?
Why did European countries join the world war 1?
How did Jacques Cartier make a difference?
Why did the emperor of qin standardized money weights and measures?
What party issued the Omaha platform?
Where was History of Alaska by Hubert Bancroft published?
What European country ended the dominance of Arab and Islamic traders in the Indian by trade network by the 1500s?
Why did Alice Paul go to jail?
What year did industrialization take place in history?
How did industrialisation change the world you live in?
When was the plane crash in Stanley County Durham?
Was it harder to defeat Germany in World War 1 or World War 2?
Which country first imported slaves in 1619?
What caused the decline of the Mauryan Empire?
Did King Louis XVI death contribute to the rise of democracy?
What is nij cultivation?
What is an important event in Alberta's history?
What people would have been a member of the second estate?
Copyright ©2025 Infospace Holdings LLC, A System1 Company. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Answers.