Births on April 23

Richard Wolstencroft, Australian director and producer

2 Mar

Concorde
In Toulouse, France, the first test flight of the Anglo-French Concorde is conducted.
17 Apr

Robert F. Kennedy
Sirhan Sirhan is convicted of assassinating Robert F. Kennedy.
16 Jul

Apollo 11
Apollo program: Apollo 11, the first mission to land astronauts on the Moon, is launched from the Kennedy Space Center at Cape Kennedy, Florida.
20 Jul

Apollo 11
Apollo program: Apollo 11's crew successfully makes the first manned landing on the Moon in the Sea of Tranquility. Americans Neil Armstrong and Buzz Aldrin became the first humans to walk on the Moon (July 21 UTC).
30 Jul

Richard Nixon
Vietnam War: US President Richard Nixon makes an unscheduled visit to South Vietnam and meets with President Nguyễn Văn Thiệu and U.S. military commanders.