Every year, Pluto Day on February 18th celebrates the discovery of the former planet. Up until 2006, the dwarf planet was considered one of the nine planets in the solar system.
Clyde Tombaugh, an American astronomer, discovered Pluto. He made the discovery at the Lowell Observatory on February 18th, 1930 84 years after the discovery of Neptune. Pluto was named for the Roman god of the Underworld. On March 19, 1930, Lowell Observatory officially announced the discovery of a 9th planet.
On August 24th, 2006, the International Astronomical Union (IAU) reduced Pluto to a dwarf planet.
Pluto Day commemorates the anniversary of its discovery each year on February 18th, 1930.
Source: https://nationaldaycalendar.com
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