June 24 is the 175th day of the year (176th in leap years) in the Gregorian calendar. There are 190 days remaining until the end of the year.
Events
Up to 1900
79 - Titus becomes Roman Emperor after the previous day's death of his father, Vespasian.
109 - Roman Emperor Trajan inaugurates the Aqua Traiana, an aqueduct that channels water from Lake Bracciano, 40 kilometers northwest of Rome.
972 - Battle of Cedynia: First documented victory of Polish forces takes place.
1128 – Battle of São Mamede, near Guimarães. Portuguese forces led by Afonso I beat his mother D.Teresa and D.Fernão Peres de Trava. After this battle, the future king calls himself "Prince of Portugal", the first step towards "official independence" in 1143.
1230 - The Siege of Jaén starts in the context of the Spanish Recoquista.
1374 – A sudden outbreak of St. John's Dance causes people in the streets of Aix-la-Chapelle, Prussia, to experience hallucinations and begin to jump and twitch uncontrollably until they collapse from exhaustion.
1963 – Zanzibar is granted internal self-government by the UK.
1967 - The UK's worst caving disaster kills 6 people at Mossdale Caverns.
1974 – The UPC label is used for the first time to ring up purchases at a supermarket.
1975 – An Eastern Airlines Boeing 727 crashes at John F. Kennedy Airport, New York. 113 people die.
1981 – For what would be the world's longest single-span suspension bridge for 17 years, the Humber Bridge, connecting Yorkshire and Lincolnshire, opens.
1993 – Yale computer science professor Dr. David Gelernter loses the sight in one eye, the hearing in one ear, and part of his right hand after receiving a mailbomb from the Unabomber.
2010 – The longest match in the history of professional tennis ends at Wimbledon, after two days. John Isner beats Nicolas Mahut 70-68 in the deciding set.