1821 — Mexico’s Independence Movement Reaches Its Decisive Moment

On 27 September 1821, the struggle for Mexican independence reached its decisive stage when the Army of the Three Guarantees, or Ejército Trigarante, entered Mexico City. The event is regarded by the Mexican government as the consummation of Mexico’s independence after more than a decade of conflict with Spanish colonial rule.

The independence struggle had begun in 1810. By 1821, Agustín de Iturbide had formed an alliance with Vicente Guerrero around the Plan of Iguala, which promoted independence, the Catholic faith and unity between different groups within New Spain. The Treaty of Córdoba, signed in August 1821, further established the framework for Mexican independence.

When the Trigarante Army entered Mexico City on 27 September, the long conflict effectively reached its conclusion. The formal Act of Independence was signed the following day.

The date remains an important part of Mexico’s historical calendar and is officially commemorated as the anniversary of the consummation of independence.

1822 — Champollion Announces a Breakthrough in Reading Egyptian Hieroglyphs

A major breakthrough in the study of ancient Egypt occurred on 27 September 1822 when French scholar Jean-François Champollion presented his findings on Egyptian hieroglyphs in Paris.

Champollion’s work built on the discovery of the Rosetta Stone, which contained the same decree in different scripts, including Greek and Egyptian writing. Earlier scholars, including Thomas Young, had made important progress, but Champollion demonstrated that hieroglyphic writing represented the sounds and language of ancient Egypt in ways that could be systematically understood.

He announced his breakthrough in a paper presented to the Académie des Inscriptions et Belles-Lettres in Paris. The achievement laid foundations for the modern study of ancient Egyptian language, history and culture.

The decipherment transformed Egyptology because inscriptions on monuments, temples, tombs and other archaeological objects could now be studied in much greater detail.

1825 — The Stockton and Darlington Railway Opens

One of the most important events in the history of transportation took place on 27 September 1825 in England when the Stockton and Darlington Railway officially opened.

George Stephenson’s locomotive, Locomotion No. 1, hauled a train from Shildon through Darlington to Stockton. The railway had primarily been designed to transport coal, but the opening-day journey also carried passengers.

The occasion attracted enormous public attention. Historical accounts estimate that hundreds of people travelled on or alongside the train, with the procession carrying coal, flour, railway workers and passengers. The journey covered approximately 26 miles and became a landmark in the development of public railway transportation.

Historic England notes that the opening is commonly associated with the first steam-powered passenger railway, although historians point out that definitions of “first railway” can vary depending on whether the focus is on locomotive operation, passenger services or the railway’s intended purpose.

The event nevertheless represented a major turning point. Railways would soon transform the movement of people, coal, manufactured goods, agricultural products and mail across Britain and eventually much of the world.

1940 — Germany, Italy and Japan Sign the Tripartite Pact

On 27 September 1940, Germany, Italy and Japan signed the Tripartite Pact in Berlin during the Second World War.

The agreement formalised the political and military alignment of the three powers and became a central component of what was later known as the Axis alliance. The pact established mutual assistance provisions and divided broad spheres of influence between the European and Asian powers.

The agreement came at a critical stage of the war. Germany had invaded Poland in September 1939, Britain and France had declared war on Germany, and German forces had subsequently occupied much of Western Europe. Italy had entered the war on Germany’s side in June 1940.

The Tripartite Pact did not create a fully integrated military command comparable to the Allied coalition. Nevertheless, it formalised the partnership among Germany, Italy and Japan and became an important feature of the international alignment of the war.

1954 — American Television Welcomes a New Late-Night Institution

On 27 September 1954, NBC premiered Tonight, the programme that became the foundation of the long-running Tonight Show television franchise.

Hosted initially by Steve Allen, the programme combined interviews, comedy, music and informal conversation in a late-night format that was then relatively new in American television. Allen’s version of the programme ran until 1957, after which Jack Paar took over.

The franchise would later become particularly associated with Johnny Carson, who hosted from 1962 to 1992. Subsequent hosts included Jay Leno, Conan O’Brien and Jimmy Fallon.

Its long history helped establish late-night television as an important part of American entertainment and popular culture.

1962 — Rachel Carson’s Silent Spring Changes the Environmental Debate

27 September 1962 also marked an important moment in the history of environmental awareness. Rachel Carson’s Silent Spring was published that month and helped bring public attention to the environmental consequences associated with widespread pesticide use.

Carson, a marine biologist and writer, examined the effects of pesticides on birds, wildlife and ecosystems. Her work became an important influence on the modern environmental movement and contributed to wider public debate about chemical regulation and ecological protection.

The book’s publication helped move environmental issues from specialist scientific discussions into mainstream public debate, influencing policymakers, scientists and conservationists.

1996 — Taliban Forces Capture Kabul

On 27 September 1996, Taliban forces entered Kabul and took control of Afghanistan’s capital after government forces withdrew.

A United Nations account recorded that Taliban forces entered Kabul early that morning and took control of the city after government forces had largely withdrawn during the previous night.

The capture marked a major turning point in Afghanistan’s civil war. The Taliban subsequently established control over much of the country and declared the Islamic Emirate of Afghanistan.

The takeover was accompanied by violence. Former Afghan president Mohammad Najibullah, who had been living in a United Nations compound in Kabul, was seized and killed after the Taliban entered the city. The United Nations documented the circumstances surrounding his death in its contemporary reporting.

The events of September 1996 would shape Afghanistan’s political and security environment for years, including the country’s relationship with neighbouring states and the wider international community.

1998 — Google Marks 27 September as Its Birthday

The modern internet also has a connection with September 27. Google has traditionally celebrated 27 September as its birthday, dating its corporate history to the period when Larry Page and Sergey Brin were developing their search engine.

Google itself notes that the precise date of the company’s founding can be confusing because Google Inc. was formally incorporated on 4 September 1998. Nevertheless, the company has celebrated 27 September as its birthday for more than two decades.

The search engine began as a university research project associated with Stanford University before developing into one of the world’s most influential internet companies.

The significance of the date therefore extends beyond a corporate anniversary. The growth of Google helped change how people locate information, navigate the web, conduct research, advertise products and communicate online.

2003 — Europe’s SMART-1 Mission Begins Its Journey to the Moon

On 27 September 2003, the European Space Agency’s SMART-1 spacecraft was launched from Kourou, French Guiana, aboard an Ariane 5 rocket.

SMART-1 stood for “Small Missions for Advanced Research in Technology.” The spacecraft was designed to test technologies for future missions while conducting scientific investigations of the Moon. It was Europe’s first mission to the Moon.

One of the mission’s most significant technological features was its solar-electric propulsion system. Instead of relying solely on conventional chemical propulsion, SMART-1 used an ion engine powered by electricity generated from sunlight.

The spacecraft took a long route to the Moon, gradually spiralling outward from Earth before reaching lunar orbit in November 2004. It subsequently carried out scientific observations of the lunar surface, including studies of its chemical composition.

SMART-1 demonstrated how relatively small spacecraft could be used to test technologies that could later support more ambitious deep-space missions.

2007 — NASA Launches the Dawn Spacecraft

Another major space milestone occurred on 27 September 2007 when NASA launched the Dawn spacecraft from Cape Canaveral, Florida.

Dawn began a journey of billions of kilometres toward the asteroid belt. Its mission was to study Vesta and Ceres, two of the largest bodies in the main asteroid belt between Mars and Jupiter.

The mission was particularly significant because Dawn was designed to orbit two different extraterrestrial destinations. Its ion propulsion system allowed it to travel between worlds rather than simply conducting a flyby of a single target.

Dawn reached Vesta in 2011 and later entered orbit around Ceres. By studying both objects, scientists gained additional information about the materials and processes involved in the formation and evolution of the early Solar System.

The mission became an important achievement in robotic planetary exploration and demonstrated the value of electric propulsion for extended deep-space missions.

2008 — China Conducts Its First Spacewalk

On 27 September 2008, Chinese astronaut Zhai Zhigang completed China’s first extravehicular activity, or spacewalk, during the Shenzhou-7 mission.

The mission was launched with three astronauts: Zhai Zhigang, Liu Boming and Jing Haipeng. Zhai exited the spacecraft while Liu assisted him and Jing remained inside. The activity lasted approximately 14 minutes.

China’s national space authorities described the achievement as the country’s first successful extravehicular activity and an important step in the development of its human spaceflight capabilities.

The mission demonstrated China’s ability to conduct operations outside a spacecraft and became an important milestone in the country’s long-term human spaceflight programme.

2019 — Millions Join Global Climate Demonstrations

On 27 September 2019, large-scale climate demonstrations took place in cities around the world as part of a global wave of protests calling for stronger action on climate change.

The demonstrations formed part of a wider movement that brought students, environmental groups and other participants into public spaces in numerous countries. Contemporary historical records place the September 2019 mobilisation among the largest coordinated climate protests of its time.

The protests reflected growing public attention to scientific warnings about climate change and demands for governments and institutions to reduce greenhouse-gas emissions.

2020 — A New War Begins in Nagorno-Karabakh

On 27 September 2020, fighting broke out between Azerbaijan and Armenian forces over the disputed Nagorno-Karabakh region.

The renewed conflict became known as the Second Nagorno-Karabakh War. It followed decades of political and military tension over the territory and surrounding areas.

The fighting produced significant casualties and displacement before a Russia-brokered ceasefire was reached in November 2020. The conflict subsequently remained an important factor in relations between Azerbaijan and Armenia.

Notable People Born on 27 September

Samuel Adams — 1722

Samuel Adams was born on 27 September 1722 in Boston, Massachusetts. He became an important figure in the American Revolutionary period and later served as governor of Massachusetts.

Hiram R. Revels — 1827

Hiram Rhodes Revels was born on 27 September 1827. He became a minister and politician and in 1870 became the first African American to serve in the United States Senate. His Senate service came during the Reconstruction era following the American Civil War.

Thomas Nast — 1840

Political cartoonist Thomas Nast was born on 27 September 1840. He became particularly influential for his satirical drawings concerning American politics and public figures in the 19th century.

His work helped demonstrate the power of political cartoons as a form of public commentary and contributed to the popularisation of several political symbols.

Meat Loaf — 1947

American singer and actor Meat Loaf, whose birth name was Marvin Lee Aday, was born on 27 September 1947. He became internationally known for his theatrical rock performances and albums including Bat Out of Hell.

Gwyneth Paltrow — 1972

American actor and entrepreneur Gwyneth Paltrow was born on 27 September 1972. Her film career included roles in Shakespeare in Love, for which she won an Academy Award, as well as the Iron Man and Avengers films.

Lil Wayne — 1982

Rapper Lil Wayne, born Dwayne Michael Carter Jr., was born on 27 September 1982 in New Orleans. He became one of the most commercially successful and influential figures in contemporary hip-hop.

Avril Lavigne — 1984

Canadian singer-songwriter Avril Lavigne was born on 27 September 1984. She rose to international prominence in the early 2000s with songs that helped establish her as one of the leading pop-rock performers of her generation.

Notable People Who Died on 27 September

Edgar Degas — 1917

French artist Edgar Degas died on 27 September 1917. He was one of the major figures associated with the Impressionist movement, although his work also incorporated characteristics that distinguished it from the work of some of his contemporaries.

Degas was particularly celebrated for paintings and drawings of dancers, horse racing, performers and everyday urban life.

Ram Mohan Roy — 1833

Indian social and religious reformer Ram Mohan Roy died on 27 September 1833 in Bristol, England. He played a significant role in intellectual and social reform movements in 19th-century India and became associated with efforts to challenge social practices and promote education and religious reform.

Braxton Bragg — 1876

American military officer Braxton Bragg died on 27 September 1876. He had served as a senior general in the Confederate Army during the American Civil War and later worked in engineering and railroad administration.

Aimee Semple McPherson — 1944

Canadian-American evangelist Aimee Semple McPherson died on 27 September 1944. She was a prominent religious broadcaster and preacher and founded the International Church of the Foursquare Gospel.

Clara Bow — 1965

American actress Clara Bow died on 27 September 1965. One of the biggest stars of the silent-film era, she became known as the “It Girl” after her 1927 film It. Her popularity helped define the image of the modern Hollywood star during the 1920s.

September 27 and World Tourism Day

September 27 is also observed internationally as World Tourism Day. The date was selected because it coincides with the anniversary of the adoption of the statutes of the World Tourism Organization in 1970.

The annual observance highlights tourism’s economic, cultural and social significance and provides an opportunity to examine how travel connects communities and countries. September 27 therefore carries significance not only as a date associated with historical events but also as an annual international observance.