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In December 2021 the agonic line crossed the Royal Observatory of Madrid on its westward drift. The previous cross of the agonic line, drifting eastward, is not accurately dated because declination measurements of that time are scarce. After collecting the data made in the Iberian Peninsula over the last 500 years and reducing them to the ROM coordinates, a geomagnetic declination curve has been generated. As a result, the previous cross of the agonic line has been dated around the year 1652.

Karl Terzaghi, reached out to Laurits Bjerrum in 1954, impressed by his paper on Norwegian quick clays' stability. At 36, Bjerrum, already a PhD and NGI director, emphasized practical research integration, influenced by centers like Imperial College London. He advocated for Soil Mechanics in civil engineering education and founded its chair in 1960. Bjerrum left a lasting legacy, earning international acclaim for his NGI work and collaborations with geotechnicals like Terzaghi and Casagrande.

1. The DC powered service of the Berlin suburban railways disturbed the observations in Potsdam and Seddin. 2. A suitable location for the establishment of a new observatory was found near by the small town of Niemegk. 3. The “Adolf-Schmidt-Observatorium für Erdmagnetismus Niemegk” was officially opened on 23 July 1930, Adolf Schmidt’s 70^th. 4. The observations started on 1 January 1932. 5. The Niemegk measurement series span over 92 years only interrupted at the end of World War II.