Wikipedia:Selected anniversaries/June 30
June 30: Independence Day in the Democratic Republic of the Congo (1960)
- 1864 - U.S. National Parks: Abraham Lincoln granted Yosemite Valley to California for "public ... recreation".
- 1905 - Albert Einstein published the article "On the Electrodynamics of Moving Bodies" and introduced the theory of special relativity.
- 1908 - The Tunguska impact event occurred in Siberia.
- 1934 - Adolf Hitler violently purged his political rivals on the Night of the Long Knives.
- 1971 - The Soyuz 11 spacecraft depressurised during reentry, killing cosmonauts Vladislav Volkov, Georgi Dobrovolski and Viktor Patsayev.