Historical eventOctober 101846

William Lassell

English astronomer William Lassell discovered Triton, the largest moon of Neptune.

In context

When
Saturday, October 10 1846180 years ago
Category
Historical eventA dated happening — a battle, treaty, launch, discovery, disaster or decision — recorded on this calendar day.
Era
19th century · 1840s
Recorded from
Wikipedia “On this day” feed

Russia, Greece and some other countries used the Julian calendar into the early 20th century, so local records may show a date up to 13 days earlier.

At a glance

Dates: From 1846.

What happened

English astronomer William Lassell discovered Triton, the largest moon of Neptune.

October 10 through the years

Other entries on the same calendar day, in order.

  1. 1846William Lassell
  2. 1998Lignes Aériennes Congolaises (1997–2003)
  3. 2002Iraq War
  4. 2004Murder of Huang Na
  5. 2007Sheikh Muszaphar Shukor
  6. 2009Armenia
  7. 2010Netherlands Antilles
  8. 20152015 Ankara bombings
  9. 2018Hurricane Michael
  10. 2018National Fire and Rescue Administration
  11. 2022Ben Bernanke

Also in 1846

  • June 14Sonoma, CaliforniaSettlers in Sonoma began rebelling against Mexico, later proclaiming the California Republic and raising a homemade flag with a bear and…
  • June 15Oregon TreatyThe Oregon Treaty extends the border between the United States and British North America, established by the Treaty of 1818, westward to…
  • July 11Death of Frederick John WhiteBritish soldier Frederick John White died after a flogging, leading to a campaign to end the practice in the British Army.
  • December 24Sultanate of Brunei (1368–1888)The Sultanate of Brunei ceded the island of Labuan to the British Empire.
  • June 28Adolphe SaxBelgian musician Adolphe Sax patented his design of the saxophone (example pictured).
  • June 19BaseballThe first officially recorded baseball game in U.S. history using modern rules was played in Hoboken, New Jersey, with the "New York Nine…
  • September 19La Salette-FallavauxNear La Salette-Fallavaux in southeastern France, shepherd children Mélanie Calvat and Maximin Giraud reported a Marian apparition, now k…
  • June 9Hamilton, OntarioHamilton, Ontario (skyline pictured), was granted city status by the Parliament of the Province of Canada.

Everything we record for 1846 →

Sources

Cite this page

“William Lassell”, What's On This Date, https://whatsonthisdate.com/app/event/william-lassell-1846-october-10, accessed October 29, 2026.

Cite the underlying source as well — the source links above go to the record this entry is adapted from.

Questions about this entry

When did William Lassell happen?

October 10 1846 — 180 years ago, on a Saturday.

Where does this text come from?

Wikipedia “On this day” feed. Summaries are short adaptations that link back to the source, not reprints.

How do I cite this page?

Use the ready-made citation near the sources at the bottom of the page, and follow the source link to cite the underlying record as well.

Text adapted from Wikipedia under CC BY-SA 4.0 and from Wikidata (CC0). Images come from Wikimedia Commons; credit and licence are shown with each image. Editorial entries are © What's On This Date. Sources & licensing · How this site works.