Historical event on june 30...
June 30, 1905 — Albert Einstein introduces special relativity.
June 30, 1908 — The Tunguska impact event occurs in Siberia
June 30, 1920 — Irac revolution against United Kingdom
June 30, 1934 — Kolibri operation or Night of the Long Knives
June 30, 1960 — Independence Congo from Belgium
June 30, 1971 — The crew of the Soviet Soyuz 11 spacecraft are killed when their air supply escapes through a faulty valve
June 30, 1990 East and West Germany merge their economies.
June 30, 1991 —The end of apartheid rezim
June 30, 1997 The United Kingdom transfers sovereignty over Hong Kong to the People's Republic of China.
June 30, 1997 UK hist Publication of first Harry Potter novel Harry Potter and the Philosopher's Stone
June 30, 2002 – Brazil Champion World Cup in Korea-Japan
June 30, 2008 - Spain Champion European League