About the day » Sunday April 21, 1963Calender converter

• Marjo Simons († 1999)
• Jean Marie Smith, Buffalo Ctr., Winnebago Co., IA († 2011)
• Catharina Antonia Frenken, Ottawa, Canada († 1997)
• Gerda van der Wal († 1992)
• Arnaud de La Motte de la Motte Rouge, Plancoët, Côtes-d'Armor, France († 2015)
• Henriëtte Dijk († 1963)
• Ben Brinkkemper, Zaandam, Nederland († 1986)
• Petrus Johannes Henrica Maria van den Dobbelsteen, Winssen,, Gelderland, Nederland († 1988)
• Jesse Lee VAN WECHEL, Montana U.S.A († 1998)
• Petrus Johannes Henricus Maria van den Dobbelsteen, Winssen (gemeente Ewijk) († 1988)

• * Henricus Lambertus Sars (69), 's-Hertogenbosch
• Caera Ellis Hixson (74), Fulton County Medical Center, McConnellsburg, Fulton County, Pennsylvania
• Anna Elisabeth Baas (82), Amsterdam, Noord-Holland, Nederland
• Baukje Eekema (50), Leeuwarden, Friesland, Nederland
• Adrianus Petrus Smits (39), Breda, Noord-Brabant, Nederland
• Cornelis Fredericus Schiferli (69), Zuid-Afrika
• Albert Löhnberg (56), Enschede, Enschede, Overijssel, Netherlands
• Adriana Engelberts (47), Utrecht
• Calvin Jackson Cooper (86)
• Allerdina Ottens (77), Groningen

• 1961 » Carey Hayes, American screenwriter and producer
• 1961 » Cathy Cavadini, American voice actress
• 1962 » Aavo Sarap, Estonian footballer and coach
• 1962 » Craig Robinson, American basketball player and coach
• 1962 » Les Lancaster, American baseball player and coach
• 1963 » John Cameron Mitchell, American actor, director, and screenwriter
• 1963 » Ken Caminiti, American baseball player († 2004)
• 1963 » Roy Dupuis, Canadian actor
• 1964 » Alex Baumann, Czech-Canadian swimmer
• 1964 » Ludmila Engquist, Russian-Swedish hurdler

• 1948 » Aldo Leopold, American ecologist and author (b. 1887)
• 1952 » Leslie Banks, American actor, director and producer (b. 1890)
• 1954 » Emil Leon Post, Polish-American mathematician and logician (b. 1897)
• 1956 » Charles MacArthur, American playwright and screenwriter (b. 1895)
• 1965 » Edward Victor Appleton, English-Scottish physicist and academic, Nobel Prize laureate (b. 1892)
• 1971 » François Duvalier, Haitian physician and politician, 40th President of Haiti (b. 1907)
• 1973 » Arthur Fadden, Australian accountant and politician, 13th Prime Minister of Australia (b. 1894)
• 1973 » Kemal Tahir, Turkish journalist and author (b. 1910)
• 1974 » Chic Harley, American football player (b. 1894)
• 1977 » Gummo Marx, American vaudevillian and talent agent (b. 1893)

1. Jan
2. Johannes
3. Robert
4. Peter
5. Hendrik
6. John
7. Cornelis
8. Ronald
9. Willem
10. Pieter
11. Paul
12. Johan
13. Gerrit
14. Dirk
15. Michael
16. David

1. Maria
2. Johanna
3. Anna
4. Elisabeth
5. Cornelia
6. Yvonne
7. Monique
8. Ingrid
9. Jolanda
10. Catharina
11. Linda
12. Wilhelmina
13. Karin
14. Adriana
15. Anita
16. Jacqueline

• Koningin Juliana (Huis van Oranje-Nassau) was from September 4, 1948 till April 30, 1980 sovereign of the Netherlands (also known as Koninkrijk der Nederlanden)
• In The Netherlands , there was from May 19, 1959 to July 24, 1964 the cabinet De Quay, with Prof. dr. J.E. de Quay (KVP) as prime minister.
• In The Netherlands , there was from July 24, 1963 to April 14, 1965 the cabinet Marijnen, with Mr. V.G.M. Marijnen (KVP) as prime minister.
• The Netherlands had about 11.9 million citizens.
• April 16 » Dr. Martin Luther King Jr. pens his Letter from Birmingham Jail while incarcerated in Birmingham, Alabama for protesting against segregation.
• April 24 » Marriage of Princess Alexandra of Kent to Angus Ogilvy at Westminster Abbey in London.
• May 25 » The Organisation of African Unity is established in Addis Ababa, Ethiopia.
• June 11 » American Civil Rights Movement: Governor of Alabama George Wallace defiantly stands at the door of Foster Auditorium at the University of Alabama in an attempt to block two black students, Vivian Malone and James Hood, from attending that school. Later in the day, accompanied by federalized National Guard troops, they are able to register.
• November 1 » The Arecibo Observatory in Arecibo, Puerto Rico, with the largest radio telescope ever constructed, officially opens.
• November 22 » The Beatles release With the Beatles.

The temperature on April 21, 1963 was between 10.3 °C and 16.6 °C and averaged 12.5 °C. There was 4.0 mm of rain during 5.3 hours. There was 5.6 hours of sunshine (39%). The heavily clouded was. The average windspeed was 2 Bft (weak wind) and was prevailing from the south-southwest.