Pluto Classification
The International Astronomical Union adopts a planet definition that places Pluto in the new dwarf-planet category.
Follow Owen Gingerich through 1 dated historical records for United States of America.
A chronological timeline drawn from matching World History Database records.
The International Astronomical Union adopts a planet definition that places Pluto in the new dwarf-planet category.
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.