Wikipedia:Wikipedia:Selected anniversaries/August
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August 1: Emancipation Day in Trinidad and Tobago; Lammas in England and Scotland; Imbolc in the Southern Hemisphere; Swiss National Day in Switzerland
- 1774 – British scientist Joseph Priestley (pictured) discovered oxygen gas, corroborating the prior discovery of this element by German-Swedish chemist Carl Wilhelm Scheele.
- 1834 – Slavery was officially abolished in the majority of the British Empire as the Slavery Abolition Act 1833 came into force.
- 1927 – In the Nanchang Uprising, the first major engagement in the Chinese Civil War, Communist forces seized control over the entire city of Nanchang from the Kuomintang.
- 1944 – World War II: The Polish Home Army began the Warsaw Uprising in Warsaw against the Nazi occupation of Poland, a rebellion that lasted 63 days until it was quelled by the Germans.
- 1981 – The American cable television network MTV made its debut with the music video for the song "Video Killed the Radio Star" by The Buggles.
More anniversaries: July 31 – August 1 – August 2
August 2: International Friendship Day (2009); Day of the Republic in the Republic of Macedonia
- 216 BC – Second Punic War: Carthaginian forces led by Hannibal defeated a numerically superior Roman army, near the town of Cannae in Apulia in southeast Italy.
- 1870 – Tower Subway, one of the world's first underground tube railways, opened beneath the River Thames in London.
- 1903 – In present-day Republic of Macedonia and Greece, the Internal Macedonian Revolutionary Organization started the Ilinden Uprising against the Ottoman Empire (monument pictured).
- 1980 – A terrorist bomb exploded at the Central Station of Bologna, Italy, killing 85 people and wounding more than 200.
- 1989 – The Indian Peace Keeping Force began killing 64 minority Sri Lankan Tamil civilians over a two-day period in Valvettiturai, Sri Lanka.
- 1990 – Iraq invaded Kuwait, overrunning the Kuwaiti military within two days, and eventually sparking the outbreak of the Gulf War seven months later.
More anniversaries: August 1 – August 2 – August 3
August 3: Civic Holiday in most areas of Canada (2009); Emancipation Day in various Caribbean countries (2009); Independence Day in Niger; Flag Day in Venezuela
- 435 – Nestorius, the originator of Nestorianism, was exiled by Byzantine Emperor Theodosius II to a monastery in Egypt.
- 1916 – Irish nationalist Sir Roger Casement was hanged at London's Pentonville Prison for treason for his role in the Easter Rising, a rebellion to win Irish independence from Britain.
- 1948 – Before the House Un-American Activities Committee of the United States House of Representatives, former spy turned government informer Whittaker Chambers (pictured) accused U.S. State Department official Alger Hiss of being a communist and a Soviet spy.
- 1949 – The Basketball Association of America agreed to merge with the National Basketball League to form the National Basketball Association.
- 2005 – President Maaouya Ould Sid'Ahmed Taya of Mauritania was overthrown in a military coup while he was attending the funeral of King Fahd in Saudi Arabia.
More anniversaries: August 2 – August 3 – August 4
- 1578 – King Sebastian I (pictured) disappeared at the Battle of Alcácer Quibir near Ksar-el-Kebir, Morocco, leading to a dynastic crisis in Portugal.
- 1704 – War of the Spanish Succession: A combined Anglo-Dutch fleet under the command of George Rooke and allied with Archduke Charles captured Gibraltar from Spain.
- 1892 – The father and stepmother of Lizzie Borden were found murdered in Fall River, Massachusetts, USA, an incident that became a cause célèbre and entered into pop culture and folklore.
- 1964 – The second of two U.S. Navy destroyers was reportedly attacked by North Vietnamese forces in the Gulf of Tonkin, sparking the U.S. Congress to pass a resolution giving President Lyndon Johnson authorization for the use of military force in Southeast Asia.
- 1964 – The bodies of three American civil rights activists were found by Federal Bureau of Investigation agents near Philadelphia, Mississippi.
- 1984 – Exactly a year after he came to power in the Republic of Upper Volta through a military coup, President Thomas Sankara changed its name to Burkina Faso.
More anniversaries: August 3 – August 4 – August 5
August 5: Raksha Bandhan (Hinduism, 2009); Tu B'Av (Judaism, 2009); Independence Day in Burkina Faso; Victory and Homeland Thanksgiving Day in Croatia
- 642 – King Penda of Mercia defeated and killed King Oswald of Northumbria at the Battle of Maserfield, traditionally believed to have been fought in Oswestry, Shropshire, England.
- 1100 – Henry I was crowned King of England in Westminster Abbey.
- 1583 – Explorer Humphrey Gilbert established the first English colony in North America at what is now St. John's, Newfoundland and Labrador, Canada.
- 1858 – American businessman and financier Cyrus West Field and his colleagues completed the first transatlantic telegraph cable.
- 1962 – Actress and model Marilyn Monroe (pictured) was found dead in her home in Brentwood, Los Angeles, an event that has become the center of one of the most debated conspiracy theories.
- 2003 – A suicide bomber detonated a car bomb outside the lobby of the JW Marriott Hotel in Setiabudi, South Jakarta, Indonesia, killing twelve people and injuring 150.
More anniversaries: August 4 – August 5 – August 6
August 6: Feast of the Transfiguration in Christianity; Independence Day in Bolivia (1825) and Jamaica (1962)
- 1538 – Spanish Conquistador Gonzalo Jiménez de Quesada founded a European urban settlement in what is today Bogotá, Colombia.
- 1806 – The Holy Roman Empire was dissolved by its last emperor Francis II during the aftermath of the War of the Third Coalition.
- 1945 – World War II: The U.S. Army Air Force bomber Enola Gay dropped an atomic bomb named Little Boy (pictured) on Hiroshima, Japan, killing as many as 140,000 people.
- 1991 – British computer programmer Tim Berners-Lee first posted files describing his ideas for a system of interlinked, hypertext documents accessible via the Internet, to be called a "World Wide Web".
- 2008 – Mauritanian President Sidi Mohamed Ould Cheikh Abdallahi was ousted from power by a group of high ranking generals that he had dismissed from office several hours earlier.
More anniversaries: August 5 – August 6 – August 7
August 7: Assyrian Martyrs Day (1933); Independence Day in Côte d'Ivoire (1960)
- 1461 – Ming Chinese general Cao Qin staged a failed coup against the Tianshun Emperor.
- 1679 – Le Griffon, a brigantine by René-Robert de LaSalle, became the first sailing ship to navigate the upper Great Lakes.
- 1782 – The Badge of Military Merit (pictured), the original Purple Heart, was established as a military decoration in the Continental Army.
- 1942 – World War II: U.S. Marines initiated the first American offensive of the Guadalcanal campaign with landings on Guadalcanal and Tulagi in the Solomon Islands.
- 1947 – An expedition led by Norwegian explorer Thor Heyerdahl on his raft, the Kon-Tiki, completed a 101-day journey across the Pacific Ocean.
- 1998 – Car bombs simultaneously exploded at the United States embassies in the East African capital cities of Dar es Salaam, Tanzania and Nairobi, Kenya, killing over 200 people and injuring over 4,500 others.
More anniversaries: August 6 – August 7 – August 8
August 8: Father's Day in Taiwan
- 1786 – Michel-Gabriel Paccard and Jacques Balmat completed the first recorded ascent of Mont Blanc (pictured) in the Alps, one of the highest mountains in Europe.
- 1870 – Liberal radicals in Ploieşti, Romania revolted against Romanian Domnitor Carol I, only to be arrested the next day.
- 1876 – Thomas Edison received a patent for his mimeograph machine, a printing machine that was one of the forerunners to the photocopier.
- 1918 – The Battle of Amiens began in Amiens, France, marking the start of the Allied Powers' Hundred Days Offensive through the German front lines that ultimately led to the end of World War I.
- 1963 – In one of the largest robberies in British history, a gang of 15 train robbers stole £2.6 million in bank notes at Bridego Railway Bridge, Ledburn, Buckinghamshire, England.
- 1988 – The 8888 Uprising, a series of marches, demonstrations, protests, and riots against the one-party state of the Burma Socialist Programme Party in Burma, began.
More anniversaries: August 7 – August 8 – August 9
August 9: National Day for Singapore (1965); National Women's Day in South Africa
- 48 BC – Julius Caesar and the Populares defeated Pompey and the Optimates at the Battle of Pharsalus, solidifying his control over the Roman Republic.
- 1173 – The construction of a campanile, which would eventually become the Leaning Tower of Pisa, began.
- 1842 – The Webster-Ashburton Treaty was signed, clarifying the Canada – United States border between Lake Superior and the Lake of the Woods, and the location of the Maine – New Brunswick border.
- 1942 – British Raj authorities arrested Mahatma Gandhi and various leaders of the Congress Party, beginning the suppression of the Quit India Movement.
- 1945 – World War II: USAAF bomber Bockscar dropped an atomic bomb named "Fat Man", devastating Nagasaki, Japan.
- 1969 – Followers of cult leader Charles Manson murdered pregnant actress Sharon Tate (pictured) and four others in her Benedict Canyon, Los Angeles home.
- 1974 – The Watergate scandal: Richard Nixon became the first (and to date only) President of the United States to resign from office.
More anniversaries: August 8 – August 9 – August 10
August 10: Independence Day in Ecuador; International Biodiesel Day; Feast Day of Saint Lawrence
- 1628 – The Swedish warship Vasa (pictured) sank after sailing less than a nautical mile into her maiden voyage from Stockholm on her way to fight in the Thirty Years' War.
- 1675 – The foundation stone of the Royal Greenwich Observatory, today the basis of the Prime Meridian, was laid in Greenwich, London.
- 1792 – French Revolution: Insurrectionists in Paris stormed the Tuileries Palace, effectively ending the French monarchy until it was restored in 1814.
- 1846 – The United States Congress established the Smithsonian Institution, an educational and research institute and associated museum complex.
- 1953 – First Indochina War: The French Union withdrew its forces from Operation Camargue against the Viet Minh in central modern-day Vietnam.
- 1981 – The severed head of kidnapped six-year-old Adam Walsh was found in a canal in Vero Beach, Florida, prompting his father John to become an advocate for victims' rights, helping to spur the formation of the National Center for Missing and Exploited Children.
- 2006 – British police arrested 25 people suspected in an alleged terrorist plot to detonate liquid explosives carried on board at least 10 airliners travelling from the UK to the United States and Canada.
More anniversaries: August 9 – August 10 – August 11
August 11: Independence Day in Chad (1960)
- 3114 BC – The epoch of the Mesoamerican Long Count calendar, a non-repeating, vigesimal calendar used by the Maya civilization and several other Mesoamerican cultures, occurred.
- 1492 – The first papal conclave held in the Sistine Chapel elected Roderic Borja as Pope Alexander VI to succeed Pope Innocent VIII.
- 1828 – William Corder was hanged at Bury St Edmunds, England for murdering Maria Marten at the Red Barn.
- 1952 – King Talal of Jordan abdicated due to health reasons and was succeeded by his eldest son Hussein (pictured).
- 1965 – Violent race rioting began in the Watts district of Los Angeles, lasting for six days and left 34 people dead and 1,032 others injured.
- 1988 – Osama bin Laden, Abdullah Azzam and several senior leaders of the Egyptian Islamic Jihad formed what is now known as Al-Qaeda to continue jihad elsewhere around the world after the Soviet war in Afghanistan ended.
More anniversaries: August 10 – August 11 – August 12
August 12: Mother's Day and Queen Sirikit's Birthday in Thailand; International Youth Day
- 1099 – The First Crusade concluded with the Battle of Ascalon and Fatimid forces under Al-Afdal Shahanshah retreating to Egypt.
- 1676 – Praying Indian John Alderman shot and killed King Philip, the Wampanoag war chief, ending King Philip's War.
- 1877 – American astronomer Asaph Hall discovered Deimos, the smaller of the two moons of Mars.
- 1883 – The last known Quagga, a subspecies of the Plains zebra, died at the Artis Magistra zoo in Amsterdam.
- 1981 – The IBM Personal Computer (pictured), the original version and progenitor of the IBM PC compatible hardware platform was introduced.
- 2000 – The Oscar class submarine K-141 Kursk of the Russian Navy exploded and sank in the Barents Sea during a military exercise.
More anniversaries: August 11 – August 12 – August 13
August 13: Independence Day for the Central African Republic (1960)
- 1521 – After an extended siege, forces led by Spanish Conquistador Hernán Cortés captured Tlatoani Cuauhtémoc and conquered the Aztec capital of Tenochtitlan.
- 1704 – The combined forces of England, the Holy Roman Empire, and the United Provinces defeated France and Bavaria in the Battle of Blenheim (pictured), one of the turning points of the War of the Spanish Succession.
- 1913 – English inventor Harry Brearley developed stainless steel using an electric furnace.
- 1937 – The Battle of Shanghai broke out, eventually becoming one of the largest and bloodiest battles of the entire Second Sino-Japanese War.
- 1960 – The Central African Republic gained its independence from France, with David Dacko as its first president.
More anniversaries: August 12 – August 13 – August 14
August 14: Krishna Janmashtami (Hinduism, 2009); Independence Day in Pakistan
- 1385 – Forces under John I defeated the Castilians in the Battle of Aljubarrota, ending the 1383–1385 Crisis in Portugal.
- 1842 – American Indian Wars: United States general William Jenkins Worth declared the Second Seminole War to be over.
- 1888 – A recording of English composer Arthur Sullivan's The Lost Chord (audio clip right), one of the first recordings of music ever made, was played during a press conference introducing Thomas Edison's phonograph in London.
- 1994 – Leftist revolutionary and mercenary Ilich Ramírez Sánchez, known as Carlos the Jackal, was handed over to French agents by his own bodyguards.
- 2005 – Helios Airways Flight 522 crashed into a mountain north of Marathon and Varnava, Greece, killing all 121 on board.
- 2006 – The United Nations brokered a ceasefire in the Lebanon War between Lebanon and Israel.
More anniversaries: August 13 – August 14 – August 15
August 15: Victory over Japan Day; Independence Day in North Korea & South Korea (1945), India (1947), and Congo (1960); The Feast of the Assumption/Feast of the Dormition in Christianity.
- 778 – A Frankish army led by Roland was defeated by the Basques at Roncevaux Pass in the Pyrenees on the border between France and Spain, a tale retold in the Old French epic poem The Song of Roland.
- 1248 – The foundation stone of Cologne Cathedral (pictured), built to house the relics of the Three Wise Men, was laid.
- 1914 – The Panama Canal opened to traffic, providing a shortcut from the Atlantic to the Pacific Ocean through the Isthmus of Panama.
- 1945 – The Gyokuon-hōsō was broadcast in Japan, announcing the unconditional surrender of the Japanese army and naval forces, bringing World War II to a close.
- 1947 – The British Raj was partitioned into the Union of India and the Dominion of Pakistan.
- 1998 – A car bomb attack carried out by the Real Irish Republican Army killed 29 people and injured approximately 220 others in Omagh, Northern Ireland.
More anniversaries: August 14 – August 15 – August 16
August 16: Children's Day in Paraguay
- 1777 – American Revolutionary War: The Americans led by General John Stark routed British and Brunswick troops under Friedrich Baum at the Battle of Bennington in Walloomsac, New York.
- 1819 – Cavalry charged into a crowd of 60–80,000 (pictured) gathered at St Peter's Field, Manchester, England, to demand the reform of parliamentary representation, killing 15 people and injuring 400–700 others.
- 1896 – A group led by Skookum Jim Mason discovered gold near Dawson City, Yukon, Canada, setting off the Klondike Gold Rush.
- 1960 – Joseph Kittinger parachuted from a balloon over New Mexico at 102,800 feet (31,330 m), setting records for high-altitude jump, free-fall height, and fastest speed by a human without an aircraft.
- 1977 – Elvis Presley, "The King of Rock and Roll", was officially pronounced dead at Baptist Memorial Hospital in Memphis, Tennessee, after he was found unresponsive on the floor of his Graceland bathroom.
More anniversaries: August 15 – August 16 – August 17
August 17: Paryusana Parva begins (Jainism, 2009); Independence Day in Indonesia (1945) and Gabon (1960)
- 986 – Byzantine–Bulgarian Wars: The Bulgarians defeated the Byzantine forces at the Gate of Trajan near present-day Ihtiman, with Byzantine Emperor Basil II barely escaping.
- 1862 – A council of Dakota decided to attack settlements throughout the Minnesota River valley in an effort to drive whites out of the area, sparking the Dakota War.
- 1914 – World War I: Ignoring orders to retreat, Hermann von François (pictured) led a successful counterattack defending East Prussia at the Battle of Stallupönen and scored the first German victory in the Eastern Front.
- 1969 – Hurricane Camille struck the Mississippi coast of the United States, killing 259 people and causing US$1.42 billion in damages.
- 1999 – A 7.4 magnitude earthquake struck northwestern Turkey, killing over 17,000 people and leaving approximately half a million people homeless.
More anniversaries: August 16 – August 17 – August 18
August 18: Long Tan Day in Australia (1966)
- 1572 – French Wars of Religion: Marguerite de Valois (pictured) was married to Huguenot King Henry of Navarre, in a supposed attempt to reconcile Protestants and Catholics.
- 1868 – Astronomer Pierre Janssen discovered helium while analyzing the chromosphere of the sun during a total solar eclipse in Guntur, India.
- 1891 – A hurricane struck the island of Martinique, killing about 700 people.
- 1920 – The Nineteenth Amendment to the United States Constitution was ratified, guaranteeing women's suffrage.
- 1976 – North Korean soldiers killed two American soldiers in the Joint Security Area of the Korean Demilitarized Zone, heightening tensions over a 100-foot (30 m) poplar tree that blocked the line of sight between a United Nations Command checkpoint and an observation post.
- 1989 – Leading Colombian presidential hopeful Luis Carlos Galán was assassinated during a public demonstration in the town of Soacha, Cundinamarca.
More anniversaries: August 17 – August 18 – August 19
August 19: Independence Day in Afghanistan (1919); National Aviation Day in the United States
- 1666 – Second Anglo–Dutch War: English Rear-Admiral Robert Holmes led a raid on Terschelling and on the Vlie estuary in the Netherlands, destroying 130 merchant ships within two days.
- 1812 – War of 1812: American Navy frigate USS Constitution (pictured in 1997) defeated British Royal Navy frigate HMS Guerrière off the coast of Nova Scotia, Canada, earning her nickname "Old Ironsides".
- 1953 – The government of Iranian Prime Minister Mohammed Mosaddeq was overthrown in a coup d'état and was replaced by Fazlollah Zahedi.
- 1960 – Russian space dogs Belka and Strelka began to orbit the Earth aboard the Korabl-Sputnik-2 spacecraft.
- 1980 – Saudi Arabian Airlines Flight 163 burned after making an emergency landing at Riyadh International Airport in Riyadh, Saudi Arabia, killing all 301 people on board.
- 2003 – A car bomb destroyed the United Nations headquarters at Baghdad's Canal Hotel, killing Brazilian diplomat Sérgio Vieira de Mello and 21 others.
More anniversaries: August 18 – August 19 – August 20
August 20: St. Stephen's Day in Hungary
- 917 – Byzantine–Bulgarian Wars: Bulgarians led by Tsar Simeon I (seal pictured) drove the Byzantines out of Thrace with a decisive victory in the Battle of Anchialus.
- 1794 – American troops defeated the Western Confederacy, a Native American alliance, at the Battle of Fallen Timbers, the decisive battle of the Northwest Indian War.
- 1804 – The Lewis and Clark Expedition, exploring the Louisiana Purchase, suffered its only death when Sergeant Charles Floyd died, apparently from acute appendicitis.
- 1991 – Singing Revolution: Estonia regained its independence from the Soviet Union.
- 1998 – The Al-Shifa pharmaceutical factory in Sudan was destroyed by a bombing attack launched by the United States in retaliation for the August 7 U.S. embassy bombings.
More anniversaries: August 19 – August 20 – August 21
August 21: Ramadan begins at sunset (Islam, 2009); Ninoy Aquino Day in the Philippines
- 1772 – A bloodless coup d'état led by Gustav III (pictured) was completed with the adoption of a new Swedish Constitution.
- 1831 – Nat Turner led a slave revolt in Southampton County, Virginia, USA, but it was suppressed about 48 hours later.
- 1959 – Under the terms of the Hawaii Admission Act and a subsequent plebiscite, the Territory of Hawaii was officially admitted as the 50th U.S. state.
- 1963 – The Army of the Republic of Vietnam Special Forces loyal to Ngo Dinh Nhu, brother of President Ngo Dinh Diem, raided and vandalised Buddhist pagodas across the country, arresting thousands and leaving an estimated hundreds dead.
- 1968 – The "Prague Spring", a period of political liberalization in Czechoslovakia, abruptly ended after Warsaw Pact troops invaded the country, killing 72 Czechoslovaks and arresting their leader Alexander Dubček.
More anniversaries: August 20 – August 21 – August 22
August 22: First day of Ramadan (Islam, 2009); Feast Day of the Queenship of Mary (Roman Catholic Church)
- 1639 – The British East India Company bought a small strip of land on what is today Chennai, the capital city of the Indian state of Tamil Nadu, from the King of the Vijayanagara Empire, Peda Venkata Raya.
- 1791 – A slave rebellion erupted in the French colony of Saint-Domingue, starting the Haitian Revolution.
- 1864 – The Red Cross movement led by Henry Dunant (pictured) officially began when twelve European nations signed the First Geneva Convention, establishing the International Committee of the Red Cross.
- 1910 – Korea was annexed by Japan with the signing of the Japan–Korea Annexation Treaty, beginning a period of Japanese rule of Korea that lasted until the end of World War II.
- 1922 – Irish Civil War: Irish National Army commander-in-chief Michael Collins was assassinated in an ambush while en route through County Cork at the village of Béal na mBláth.
More anniversaries: August 21 – August 22 – August 23
August 23: Ganesh Chaturthi (Hinduism, 2009); International Day for the Remembrance of the Slave Trade and its Abolition; Liberation Day in Romania
- 1784 – Western North Carolina declared itself an independent state under the name of Franklin.
- 1914 – In their first major action of World War I, the British Expeditionary Force defeated German troops in Mons, Belgium.
- 1929 – Arabs began attacking Jews in Hebron in the British Mandate of Palestine, killing over sixty people in two days. (A man reflecting on the aftermath pictured)
- 1939 – World War II: Nazi Germany and the Soviet Union agreed to the Molotov–Ribbentrop Pact, a 10-year, mutual non-aggression treaty that was eventually broken when the Germans invaded the Soviet Union two years later.
- 1958 – The People's Liberation Army began an intense artillery bombardment of Quemoy, sparking the Second Taiwan Strait Crisis.
- 1989 – Singing Revolution: Approximately two million people joined their hands to form an over 600 km (373 mi) long human chain across the Estonian, Latvian and Lithuanian Soviet republics.
More anniversaries: August 22 – August 23 – August 24
August 24: Independence Day in Ukraine (1991)
- 79 – The volcano Mount Vesuvius (artist's depiction pictured) erupted, burying the towns of Pompeii, Herculaneum, and Stabiae in Italy.
- 1814 – War of 1812: British forces invaded Washington, D.C., setting fire to various U.S. government buildings, including what is now the White House.
- 1821 – The Treaty of Córdoba was signed in Córdoba, Veracruz, ratifying the Plan of Iguala and concluding Mexico's War of Independence from Spain.
- 1857 – The New York City branch of the Ohio Life Insurance and Trust Co., collapsed following widespread embezzlement, leading to a severe recession that caused about 5,000 businesses to fail.
- 1942 – World War II: The United States aircraft carrier Saratoga sank the Japanese aircraft carrier Ryūjō at the Battle of the Eastern Solomons near Santa Isabel, Solomon Islands, helping to lead to an Allied powers victory.
- 2006 – The International Astronomical Union redefined the term "planet", reclassifying Pluto as a dwarf planet.
More anniversaries: August 23 – August 24 – August 25
August 25: Independence Day in Uruguay (1825)
- 1537 – The Honourable Artillery Company, currently the oldest surviving regiment in the British Army, was formed by Royal Charter from King Henry VIII.
- 1609 – Italian astronomer Galileo Galilei demonstrated his first telescope, a device that became known as a terrestrial or spyglass refracting telescope, to Venetian lawmakers.
- 1835 – The New York Sun perpetrated the Great Moon Hoax, publishing articles about the supposed discovery of life on the Moon.
- 1920 – Polish forces under Józef Piłsudski successfully forced the Russians to withdraw from Warsaw at the Battle of Warsaw, the decisive battle of the Polish–Soviet War.
- 1945 – About ten days after World War II ended with Japan announcing its surrender, armed supporters of the Communist Party of China killed Baptist missionary John Birch.
- 1989 – The Voyager 2 spacecraft (pictured) made its closest approach to Neptune, the last planet visited before leaving the solar system.
More anniversaries: August 24 – August 25 – August 26
August 26: Qi Xi in the Chinese lunar calendar (2009); Namibia Day
- 1071 – Byzantine-Seljuk wars: Seljuk Turks led by Alp Arslan captured Byzantine Emperor Romanos IV at the Battle of Manzikert (pictured).
- 1346 – Hundred Years' War: English forces established the military supremacy of the English longbow over the French combination of crossbow and armoured knights at the Battle of Crécy.
- 1789 – French Revolution: The Declaration of the Rights of Man and of the Citizen, defining a set of individual and collective rights of the people, was approved by the National Constituent Assembly at Versailles.
- 1928 – At a cafe in Paisley, Scotland, May Donoghue found the remains of a snail in her bottle of ginger beer, causing her to launch one of the landmark civil action cases in British common law, Donoghue v Stevenson.
- 1968 – The U.S. Democratic Party's National Convention began at the International Amphitheatre in Chicago, sparking four days of clashes between anti–Vietnam War protesters and police.
More anniversaries: August 25 – August 26 – August 27
August 27: Independence Day for Moldova (1991)
- 1776 – British forces led by William Howe defeated the American Continental Army under George Washington at the Battle of Long Island in Brooklyn, New York, the largest battle of the American Revolutionary War.
- 1883 – Four enormous explosions from the volcanic eruption of Krakatoa generated tsunamis that destroyed many settlements on Java and Sumatra in Indonesia.
- 1896 – The Anglo-Zanzibar War set the record for the shortest war in recorded history when Zanzibar surrendered less than an hour after the conflict broke out, with British forces destroying the Sultan's Palace and Harem (pictured).
- 1957 – The Constitution of Malaya came into force, three days before the Federation of Malaya achieved formal independence from the United Kingdom.
- 2003 – The planet Mars made its closest approach to Earth in nearly 60,000 years: 55,758,006 kilometres (34,646,419 mi).
More anniversaries: August 26 – August 27 – August 28
August 28: Feast of Dormition/Feast of the Assumption (Julian calendar)
- 1850 – German composer Richard Wagner's romantic opera Lohengrin, containing the Bridal Chorus, was first performed under the direction of Hungarian composer Franz Liszt in Weimar, present-day Germany.
- 1914 – In the first naval battle of World War I, British ships defeated the German fleet in the Heligoland Bight area of the North Sea.
- 1924 – The August Uprising, an unsuccessful insurrection against the Soviet rule in the Georgian Soviet Socialist Republic, began.
- 1955 – African-American teenager Emmett Till was murdered near Money, Mississippi, for flirting with a white woman, energizing the nascent American Civil Rights Movement.
- 1963 – Martin Luther King, Jr. (pictured) delivered his "I Have a Dream" speech from the steps of the Lincoln Memorial in Washington, D.C., describing his desire for a future where blacks and whites would coexist harmoniously as equals.
More anniversaries: August 27 – August 28 – August 29
August 29: Feast day for the Beheading of St. John the Baptist (Christianity)
- 1526 – Ottoman forces led by Suleiman the Magnificent (pictured) defeated and killed Louis II, the last Jagiellonian king of Hungary and Bohemia, at the Battle of Mohács.
- 1756 – As neighboring countries began conspiring against him, Frederick II of Prussia launched a preemptive invasion of Saxony, starting the Seven Years' War.
- 1842 – The Treaty of Nanking, an Unequal Treaty ending the First Opium War, was signed, forcing the Chinese Qing Dynasty to give foreign trading privileges, war reparations, control of Hong Kong Island, and other concessions to the British.
- 2003 – Two car bombs exploded outside of the Imam Ali Mosque in Najaf, killing Ayatollah Mohammed Baqir al-Hakim, the spiritual leader of the Supreme Islamic Iraqi Council, and over eighty others.
- 2005 – Storm surges of Hurricane Katrina caused multiple breaches in levees around New Orleans, flooding about 80 percent of the city and many neighboring areas for weeks.
More anniversaries: August 28 – August 29 – August 30
August 30: St. Rose of Lima's Day in Peru; Victory Day in Turkey
- 1813 – Napoleonic Wars: Forces of the Sixth Coalition under Michael Andreas Barclay de Tolly (pictured) captured French General Dominique Vandamme and thousands of his soldiers at the Battle of Kulm.
- 1835 – European settlers landing on the north banks of the Yarra River in Southern Australia founded the city of Melbourne.
- 1862 – American Civil War: James Longstreet and Stonewall Jackson led their Confederate troops to a decisive victory against John Pope's Union Army at the Second Battle of Bull Run in Prince William County, Virginia.
- 1918 – Fanny Kaplan shot and wounded Bolshevik leader Vladimir Lenin, helping to spark the Red Terror in the Soviet Union, a repression against Socialist-Revolutionary Party members and other political opponents.
- 1999 – The people of East Timor voted for independence from Indonesia in a United Nations-supervised referendum.
More anniversaries: August 29 – August 30 – August 31
August 31: Independence Day in Malaysia (1957), Trinidad and Tobago (1962) and Kyrgyzstan (1991)
- 1422 – As the only heir to the throne, Henry VI became King of England at the age of eight months following the death of his father Henry V.
- 1888 – Mary Ann Nichols' body was found on the ground in front of a gated stable entrance in Buck's Row, London, allegedly the first victim of the unidentified serial killer known as Jack the Ripper.
- 1907 – The Great Game: Russia and the United Kingdom signed the Anglo-Russian Entente, defining their respective spheres of interest in Persia, Afghanistan, and Tibet.
- 1939 – Nazi forces mounted a staged attack on a German radio station (radio tower pictured) in Gleiwitz, then part of Germany, to create the appearance of Polish aggression on their country, giving them an excuse to invade Poland the following day and begin World War II in Europe.
- 1986 – After a collision with a freighter, the Soviet ocean liner Admiral Nakhimov sank in the Tsemes Bay area of the Black Sea within seven minutes, killing more than 400 people on board.
More anniversaries: August 30 – August 31 – September 1
Selected anniversaries/On this day archive
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