HISTORICAL CHRONOLOGY

On This Day in History

Discover key historical events within the Genesis range (1950–2049) that occurred on this calendar day, and claim their commemorative registry plaques.

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Historical chronology for September 20

September 20

11 historical milestones registered between 1950 and 2049

September 20, 1967 AVAILABLE

Sweden, Norway, and Denmark submit the Greek case alleging human rights violations by the Greek junta.

Wikipedia: Greek case
September 20, 1967 AVAILABLE

L. Ron Hubbard, the founder of Scientology, announced the story of Xenu in a taped lecture sent to all Scientologists.

Wikipedia: L. Ron Hubbard
L. Ron Hubbard
September 20, 1971 AVAILABLE

Hurricane Irene (satellite image pictured) moved into the Pacific Ocean from the Atlantic, making it the first actively tracked tropical cyclone to do so.

Wikipedia: Hurricane Irene–Olivia
Hurricane Irene–Olivia
September 20, 1973 AVAILABLE

Billie Jean King defeated Bobby Riggs in straight sets at the Astrodome in Houston, Texas, in an internationally televised tennis match dubbed the "Battle of the Sexes".

Wikipedia: Billie Jean King
Billie Jean King
September 20, 1977 AVAILABLE

A series of celestial phenomena of disputed nature was observed in the western Soviet Union, Finland and Denmark.

Wikipedia: Petrozavodsk phenomenon
Petrozavodsk phenomenon
September 20, 1984 AVAILABLE

The Cosby Show, which became one of three U.S. television shows to have the highest ratings five years in a row, premiered with its pilot episode.

Wikipedia: The Cosby Show
The Cosby Show
September 20, 1988 AVAILABLE

British prime minister Margaret Thatcher (pictured) gave a landmark speech at the Belfry of Bruges, Belgium, against federalism in the European Economic Community.

Wikipedia: Margaret Thatcher
Margaret Thatcher
September 20, 1997 AVAILABLE

Hurricane Erika, the strongest and longest-lasting hurricane of the 1997 Atlantic hurricane season, dissipated after causing flooding and power outages throughout Puerto Rico.

Wikipedia: 1997 Atlantic hurricane season
1997 Atlantic hurricane season
September 20, 2000 AVAILABLE

The Real Irish Republican Army carried out a rocket-launcher attack on the MI6 headquarters in London, with no casualties and minimal damage recorded.

Wikipedia: Real Irish Republican Army
September 20, 2008 AVAILABLE

An explosive-laden truck detonated in front of the Marriott hotel in Islamabad, Pakistan, killing 54 people and injuring 266 others.

Wikipedia: Islamabad Marriott Hotel bombing
Islamabad Marriott Hotel bombing
September 20, 2011 AVAILABLE

The United States military ended its "don't ask, don't tell" policy, consequently allowing gay and lesbian people to serve openly.

Wikipedia: Don't ask, don't tell
Don't ask, don't tell