On This Day

Clyde Tombaugh photographs dwarf planet Pluto

Clyde William Tombaugh (February 4, 1906 – January 17, 1997) was an American astronomer and telescope maker, best known for discovering Pluto in 1930, marking the first detection of what would...

Clyde William Tombaugh (February 4, 1906 – January 17, 1997) was an American astronomer and telescope maker, best known for discovering Pluto in 1930, marking the first detection of what would eventually be recognized as the Kuiper belt. At the time, Pluto was referred to as the ninth planet in the Solar System, a classification that stood for over seven decades.

Born in Illinois, and raised on farms in Kansas, Tombaugh was largely self-educated in astronomy and optical engineering, building his own telescopes from spare parts and grinding lenses by hand. His skill and determination led to a position at Lowell Observatory in Flagstaff, Arizona, where he conducted photographic surveys of the night sky.

Historical Significance

Clyde William Tombaugh (February 4, 1906 – January 17, 1997) was an American astronomer and telescope maker, best known for discovering Pluto in 1930, marking the first detection of what would eventually be recognized as the Kuiper belt.

Events Before

  1. Australian cricket icon Don Bradman follows up a first-innings 79 by scoring 112 in the third Test against England in Me

    Australian cricket icon Don Bradman follows up a first-innings 79 by scoring 112 in the third Test against England in Melbourne; his first of 29 Test centuries

  2. Mitford sister Diana Mitford (18) marries Irish peer Bryan Walter Guinness (23) in the British society wedding of the ye

    Mitford sister Diana Mitford (18) marries Irish peer Bryan Walter Guinness (23) in the British society wedding of the year

  3. Vatican City, the world's smallest country, becomes an enclave of Rome

    Vatican City, officially the Vatican City State (Italian: Stato della Città del Vaticano; Latin: Status Civitatis Vaticanae), often shortened as the Vatican, is a landlocked sovereign city-state.

  4. Saint Valentine's Day Massacre in Chicago, seven gangsters are killed, allegedly on Al Capone's orders

    Saint Valentine's Day Massacre in Chicago, seven gangsters are killed, allegedly on Al Capone's orders

  5. Cleveland Indians become the first MLB team to permanently feature numbers on the backs of uniforms; numbers correspond

    Cleveland Indians become the first MLB team to permanently feature numbers on the backs of uniforms; numbers correspond to the position in the batting order

Events After

  1. "City Lights", American silent romantic comedy film directed by Charlie Chaplin, starring himself and Virginia Cherrill,

    "City Lights", American silent romantic comedy film directed by Charlie Chaplin, starring himself and Virginia Cherrill, premieres at Los Angeles Theater

  2. New Zealand's worst natural disaster, the Hawke's Bay earthquake, kills 256 and injures thousands, devastating Napier an

    New Zealand's worst natural disaster, the Hawke's Bay earthquake, kills 256 and injures thousands, devastating Napier and the Hawke's Bay region

  3. The original "Dracula" film starring Bela Lugosi as the titular vampire is released

    Renfield is a 2023 American action comedy horror film inspired by characters from Bram Stoker's 1897 novel Dracula and its 1931 feature film adaptation.

  4. Chicago White Sox and NY Giants play the first exhibition night game

    The Chicago White Sox are an American professional baseball team based in Chicago. The White Sox compete in Major League Baseball (MLB) as a member club of the American League (AL) Central Division.

  5. "The Star-Spangled Banner" officially becomes the US national anthem by congressional resolution; lyrics by Francis Scot

    "The Star-Spangled Banner" officially becomes the US national anthem by congressional resolution; lyrics by Francis Scott Key in 1814 are set to John Stafford Smith's 18th-century tune "The Anacreontic Song"

More from the 1930s

Frequently Asked Questions

What happened on January 23, 1930?
Clyde William Tombaugh (February 4, 1906 – January 17, 1997) was an American astronomer and telescope maker, best known for discovering Pluto in 1930, marking the first detection of what would eventually be recognized as the Kuiper belt. At the time, Pluto was referred to as the ninth planet in the Solar System, a classification that stood for over seven decades. Born in Illinois, and raised on farms in Kansas, Tombaugh was largely self-educated in astronomy and optical engineering, building his own telescopes from spare parts and grinding lenses by hand.
Why is Clyde Tombaugh photographs dwarf planet Pluto significant?
Clyde William Tombaugh (February 4, 1906 – January 17, 1997) was an American astronomer and telescope maker, best known for discovering Pluto in 1930, marking the first detection of what would eventually be recognized as the Kuiper belt.

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