Lowell Observatory
Percival Lowell founds the Lowell Observatory in Flagstaff, Arizona
Historical biography archive · Updated 2026-11-03
Percival Lowell Biography and Timeline
Follow Percival Lowell through 6 dated historical records for United States of America.
Percival Lowell, historical timeline
A chronological timeline drawn from matching World History Database records.
6Distinct records
1 of 1Page
1894–1916Years on this page
1894
1906
Discovery of Planet X
Percival Lowell starts an extensive project in search of a possible ninth planet, which he terms "Planet X"
Discovery of Pluto
Percival Lowell begins an extensive search for a possible ninth planet, which he calls Planet X.
1909
Discovery of Pluto
Lowell and William H. Pickering suggest several possible celestial coordinates for the predicted Planet X.
1915
Discovery of Pluto
Lowell Observatory captures faint images of Pluto, but the object is not recognised as the predicted planet.
1916
Discovery of Pluto
Lowell continues the search for Planet X until his death in 1916 without identifying Pluto.
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.