30 June Events

June 30 is the 181st day of the year (182nd in leap years) in the Gregorian calendar. There are 184 days remaining until the end of the year. This date is slightly more likely to fall on a Tuesday, Thursday or Saturday (58 in 400 years each) than on Sunday or Monday (57), and slightly less likely to occur on a Wednesday or Friday (56). It is the last day of the first half of the year.

Events

350 – Roman usurper Nepotianus, of the Constantinian dynasty, is defeated and killed in Rome by troops of the usurper Magnentius.
763 – The Byzantine army of emperor Constantine V defeats the Bulgarian forces in the Battle of Anchialus.
1422 – Battle of Arbedo between the duke of Milan and the Swiss cantons.
1520 – Spanish conquistadors led by Hernán Cortés fight their way out of Tenochtitlan.
1521 – Spanish forces defeat a combined French and Navarrese army at the Battle of Noáin during the Spanish conquest of Iberian Navarre.
1559 – King Henry II of France is mortally wounded in a jousting match against Gabriel, comte de Montgomery.
1651 – The Deluge: Khmelnytsky Uprising: The Battle of Berestechko ends with a Polish victory.
1688 – The Immortal Seven issue the Invitation to William (continuing the English rebellion from Rome), which would culminate in the Glorious Revolution.
1758 – Seven Years' War: The Battle of Domstadtl takes place.
1794 – Native American forces under Blue Jacket attack Fort Recovery.
1805 – The U.S. Congress organizes the Michigan Territory.
1859 – French acrobat Charles Blondin crosses Niagara Falls on a tightrope.
1860 – The 1860 Oxford evolution debate at the Oxford University Museum of Natural History takes place.
1864 – U.S. President Abraham Lincoln grants Yosemite Valley to California for "public use, resort and recreation".
1882 – Charles J. Guiteau is hanged in Washington, D.C. for the assassination of U.S. President James Garfield.
1886 – The first transcontinental train trip across Canada departs from Montreal. It arrives in Port Moody, British Columbia on July 4.
1892 – The Homestead Strike begins near Pittsburgh, Pennsylvania.
1905 – Albert Einstein sends the article On the Electrodynamics of Moving Bodies, in which he introduces special relativity, for publication in Annalen der Physik.
1906 – The United States Congress passes the Meat Inspection Act and Pure Food and Drug Act.
1908 – The Tunguska Event, the largest impact event on Earth in human recorded history, resulting in a massive explosion over Eastern Siberia.
1912 – The Regina Cyclone, Canada's deadliest tornado event, kills 28 people in Regina, Saskatchewan
1921 – U.S. President Warren G. Harding appoints former President William Howard Taft Chief Justice of the United States.
1922 – In Washington D.C., U.S. Secretary of State Charles Evans Hughes and Dominican Ambassador Francisco J. Peynado sign the Hughes–Peynado agreement, which ends the United States occupation of the Dominican Republic.
1934 – The Night of the Long Knives, Adolf Hitler's violent purge of his political rivals in Germany, takes place.
1936 – Emperor Haile Selassie of Abyssinia appeals for aid to the League of Nations against Italy's invasion of his country.
1937 – The world's first emergency telephone number, 999, is introduced in London.
1944 – World War II: The Battle of Cherbourg ends with the fall of the strategically valuable port to American forces.
1953 – The first Chevrolet Corvette rolls off the assembly line in Flint, Michigan.
1956 – A TWA Super Constellation and a United Airlines DC-7 collide above the Grand Canyon in Arizona and crash, killing all 128 on board both airliners.
1959 – A United States Air Force F-100 Super Sabre from Kadena Air Base, Okinawa, crashes into a nearby elementary school, killing 11 students plus six residents from the local neighborhood.
1960 – Belgian Congo gains independence as Republic of the Congo (Léopoldville).
1963 – Ciaculli bombing: a car bomb, intended for Mafia boss Salvatore Greco, kills seven police officers and military personnel near Palermo.
1966 – The National Organization for Women, the United States' largest feminist organization, is founded.
1968 – Pope Paul VI issues the Credo of the People of God.
1971 – The crew of the Soviet Soyuz 11 spacecraft are killed when their air supply escapes through a faulty valve.
1972 – The first leap second is added to the UTC time system.
1974 – The Baltimore municipal strike of 1974 begins.
1977 – The Southeast Asia Treaty Organization disbands.
1985 – Thirty-nine American hostages from the hijacked TWA Flight 847 are freed in Beirut after being held for 17 days.
1986 – The U.S. Supreme Court rules in Bowers v. Hardwick that states can outlaw homosexual acts between consenting adults.
1990 – East Germany and West Germany merge their economies.
1997 – The United Kingdom transfers sovereignty over Hong Kong to China.
2013 – Nineteen firefighters die controlling a wildfire in Yarnell, Arizona.
2015 – A Hercules C-130 military aircraft with 113 people on board crashes in a residential area in Medan, Indonesia, resulting in at least 116 deaths.

Holidays and observances

Christian feast day:
Martial
Theobald of Provins
First Martyrs of the Church of Rome
June 30 (Eastern Orthodox liturgics)
Armed Forces Day (Guatemala)
Asteroid Day (International observance)
General Prayer Day (Central African Republic)
Independence Day (Democratic Republic of the Congo), celebrates the independence of Democratic Republic of the Congo from Belgium in 1960.
Navy Day (Israel)
Philippine–Spanish Friendship Day (Philippines)
Revolution Day (Sudan)
Teachers' Day (Dominican Republic)

Source: wikipedia