About the day » Friday April 21, 1911Calender converter

• Agnes Revelant († 1998)
• Adrianus Johannes Warmerdam, Noordwijkerhout († 1911)
• Martina Johanna Wuijster, Rotterdam († 1962)
• Adrianus Johannes Warmerdam, Gemeente Noordwijkerhout, Zuid-Holland, Nederland († 1911)
• Adriana van Veen, Zuilichem, Gelderland, Nederland
• Adriana Anna van Veen, Zuilichem († 1952)
• Aleida Hendrina Hulstijn, Amsterdam
• Adriaan van Rosmalen, Almkerk, Noord-Brabant, Nederland († 1930)
• Adrianus de Lange, Amsterdam, Noord-Holland, Nederland
• Adriana Clazina Cieremans, Rotterdam, Zuid-Holland, Nederland

• Adriana Maria VROLIJK (59), Oudenbosch, Halderberge, Province of North Brabant, Netherlands
• Adolphe Alexandre Letellier (69), Montroeul-sur-Haine, Hainaut, Belgique
• Anna Megens (78), Leeuwen, Gelderland, Nederland
• Antje Freerks Kalsbeek (49)
• Anna Maria Reichardt (72), Marion County
• Antoinette MINOT (71), LEUVEN
• Aagje van Oorschot (34), Dordrecht Z.H
• Anna Varenhorst (25), Amsterdam, Noord-Holland, Nederland
• Aartje Hardeman (84), Ede, Gelderland, Nederland
• Alice Anna Claus (22), Buitenzorg, Indonesië

• 1905 » Pat Brown, American lawyer and politician, 32nd Governor of California († 1996)
• 1911 » Ivan Combe, American businessman, developed Clearasil († 2000)
• 1911 » Kemal Satır, Turkish physician and politician († 1991)
• 1912 » Eve Arnold, Russian-American photojournalist († 2012)
• 1912 » Marcel Camus, French director and screenwriter († 1982)
• 1913 » Norman Parkinson, English photographer († 1990)
• 1914 » Angelo Savoldi, Italian-American wrestler and promoter, co-founded International World Class Championship Wrestling († 2013)
• 1915 » Anthony Quinn, Mexican-American actor († 2001)
• 1915 » Garrett Hardin, American ecologist, author, and academic († 2003)
• 1916 » Estella B. Diggs, American businesswoman and politician († 2013)

• 1900 » Vikramatji Khimojiraj, Indian ruler (b. 1819)
• 1910 » Mark Twain, American novelist, humorist, and critic (b. 1835)
• 1918 » Manfred von Richthofen, German captain and pilot (b. 1892)
• 1924 » Eleonora Duse, Italian actress (b. 1858)
• 1930 » Robert Bridges, English poet and author (b. 1844)
• 1932 » Friedrich Gustav Piffl, Bohemian cardinal (b. 1864)
• 1938 » Muhammad Iqbal, Indian-Pakistani philosopher and poet (b. 1877)
• 1941 » Fritz Manteuffel, German gymnast (b. 1875)
• 1945 » Walter Model, German field marshal (b. 1891)
• 1946 » John Maynard Keynes, English economist and philosopher (b. 1883)

1. Johannes
2. Jan
3. Cornelis
4. Hendrik
5. Willem
6. Pieter
7. Gerrit
8. Petrus
9. Adrianus
10. Jacob
11. Jacobus
12. Wilhelmus
13. Gerardus
14. Arie
15. Dirk
16. Hendrikus

1. Maria
2. Johanna
3. Anna
4. Cornelia
5. Wilhelmina
6. Elisabeth
7. Hendrika
8. Catharina
9. Adriana
10. Petronella
11. Jacoba
12. Geertruida
13. Grietje
14. Aaltje
15. Helena
16. Neeltje

• Koningin Wilhelmina (Huis van Oranje-Nassau) was from 1890 till 1948 sovereign of the Netherlands (also known as Koninkrijk der Nederlanden)
• In The Netherlands , there was from February 12, 1908 to August 29, 1913 the cabinet Heemskerk, with Mr. Th. Heemskerk (AR) as prime minister.
• The Netherlands had about 6.0 million citizens.
• May 15 » In Standard Oil Co. of New Jersey v. United States, the United States Supreme Court declares Standard Oil to be an "unreasonable" monopoly under the Sherman Antitrust Act and orders the company to be broken up.
• July 7 » The United States, UK, Japan, and Russia sign the North Pacific Fur Seal Convention of 1911 banning open-water seal hunting, the first international treaty to address wildlife preservation issues.
• August 14 » United States Senate leaders agree to rotate the office of President pro tempore of the Senate among leading candidates to fill the vacancy left by William P. Frye's death.
• September 1 » The armored cruiser Georgios Averof is commissioned into the Greek Navy. It now serves as a museum ship.
• October 24 » Orville Wright remains in the air nine minutes and 45 seconds in a glider at Kill Devil Hills, North Carolina.
• November 11 » Many cities in the Midwestern United States break their record highs and lows on the same day as a strong cold front rolls through.

The temperature on April 21, 1911 was between 1.3 °C and 15.1 °C and averaged 9.7 °C. There was 4.6 hours of sunshine (32%). The average windspeed was 4 Bft (moderate breeze) and was prevailing from the southwest.