March 1 » Henri Becquerel discovers radioactive decay.
March 2 » The Battle of Adwa: The Italian Army defeated by the Ethiopian Army in Adwa, Tigray, Ethiopia.
May 18 » Khodynka Tragedy: A mass panic on Khodynka Field in Moscow during the festivities of the coronation of Russian Tsar Nicholas II results in the deaths of 1,389 people.
May 26 » Charles Dow publishes the first edition of the Dow Jones Industrial Average.
December 10 » Alfred Jarry's Ubu Roi premieres in Paris. A riot breaks out at the end of the performance.
December 14 » The Glasgow Underground Railway is opened by the Glasgow District Subway Company.
Day of marriage May 20, 1921
The temperature on May 20, 1921 was between 5.7 °C and 19.3 °C and averaged 12.7 °C. There was 9.6 hours of sunshine (60%). The average windspeed was 3 Bft (moderate breeze) and was prevailing from the west. Source: KNMI
In The Netherlands , there was from September 9, 1918 to September 18, 1922 the cabinet Ruys de Beerenbrouck I, with Jonkheer mr. Ch.J.M. Ruys de Beerenbrouck (RKSP) as prime minister.
January 20 » The British K-class submarine HMS K5 sinks in the English Channel; all 56 on board die.
March 21 » The New Economic Policy is implemented by the Bolshevik Party in response to the economic failure as a result of war communism.
May 19 » The United States Congress passes the Emergency Quota Act establishing national quotas on immigration.
June 28 » Serbian King Alexander I proclaims the new constitution of the Kingdom of Serbs, Croats and Slovenes, known thereafter as the Vidovdan Constitution.
September 8 » Margaret Gorman, a 16-year-old, wins the Atlantic City Pageant's Golden Mermaid trophy; pageant officials later dubbed her the first Miss America.
October 19 » The Portuguese Prime Minister and several officials are murdered in the Bloody Night coup.
Day of death December 21, 1977
The temperature on December 21, 1977 was between -2.0 °C and 5.3 °C and averaged 1.7 °C. There was -0.1 mm of rain. There was 6.3 hours of sunshine (82%). The partly clouded was. The average windspeed was 3 Bft (moderate breeze) and was prevailing from the east-southeast. Source: KNMI
In The Netherlands , there was from Friday, May 11, 1973 to Monday, December 19, 1977 the cabinet Den Uyl, with Drs. J.M. den Uyl (PvdA) as prime minister.
In The Netherlands , there was from Monday, December 19, 1977 to Friday, September 11, 1981 the cabinet Van Agt I, with Mr. A.A.M. van Agt (CDA/KVP) as prime minister.
March 11 » The 1977 Hanafi Siege: More than 130 hostages held in Washington, D.C., by Hanafi Muslims are set free after ambassadors from three Islamic nations join negotiations.
April 21 » Annie opens on Broadway.
June 10 » James Earl Ray escapes from Brushy Mountain State Prison in Petros, Tennessee. He is recaptured three days later.
July 21 » The start of the four-day-long Libyan–Egyptian War.
September 5 » Voyager Program: NASA launches the Voyager 1 spacecraft.
October 17 » The hijacked Lufthansa Flight 181 lands in Mogadishu. The remaining hostages are later rescued.
When copying data from this family tree, please include a reference to the origin: Hans Weening, "Family tree Weening", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-weening/I161693.php : accessed October 24, 2026), "Roelf Sikkema (1896-1977)".
Copy warning
Genealogical publications are copyright protected. Although data is often retrieved from public archives, the searching, interpreting, collecting, selecting and sorting of the data results in a unique product. Copyright protected work may not simply be copied or republished.
Please stick to the following rules
Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
Do not use this data until you have checked it, preferably at the source (the archives).
State from whom you have copied the data and ideally also his/her original source.