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September 3
ON THIS DAY

September 3

5 moments across history

1976

Viking 2 Lands on Mars

Viking 2 Lands on Mars

Viking 2 Lands on Mars

Viking 2 Lands on Mars — detail

Year: 1976

On September 3, 1976, NASA’s Viking 2 lander successfully touched down in Mars’s Utopia Planitia region. It returned images and scientific data on the Martian surface, atmosphere, and soil, including results from experiments designed to search for signs of life. Together with Viking 1, it formed part of NASA’s pioneering Viking program, which achieved the first successful U.S. landings on Mars.

1971

Qatar Gains Independence

Qatar Gains Independence

Qatar Gains Independence

Qatar Gains Independence — detail

Year: 1971

On September 3, 1971, Qatar ended its special treaty relationship with Britain and became a fully independent sovereign state. Independence gave Qatar control over its foreign affairs and national development, including management of its oil and gas resources. The change came amid Britain’s withdrawal from the Persian Gulf, when Bahrain also became independent and the United Arab Emirates was formed.

1967

Sweden Switches to Right-Hand Traffic

Sweden Switches to Right-Hand Traffic

Sweden Switches to Right-Hand Traffic

Sweden Switches to Right-Hand Traffic — detail

Year: 1967

On 3 September 1967, “Dagen H,” Sweden switched all road traffic from the left side to the right. The change aligned Sweden with its neighbors and most of continental Europe, simplifying cross-border travel and vehicle use. It followed years of planning and a nationwide information campaign, despite Swedish voters rejecting the switch in a 1955 referendum.

1943

Allied Invasion of Mainland Italy

Allied Invasion of Mainland Italy

Allied Invasion of Mainland Italy

Allied Invasion of Mainland Italy — detail

Year: 1943

On September 3, 1943, British and Canadian troops crossed the Strait of Messina from Sicily and landed in Calabria during Operation Baytown. The invasion established an Allied foothold on mainland Italy, forcing German forces to withdraw northward while the Allies advanced up the peninsula. It followed the conquest of Sicily and occurred the day Italy secretly signed an armistice with the Allies, although Germany continued the Italian campaign.