15 September 1917Death of Mata HariMata Hari
Death of Mata Hari, executed for espionage
Historical records for Netherlands in 1917, rendered directly from the World History Database and ordered by month, day and event.
Death of Mata Hari, executed for espionage
Shot in Paris by the Germans for espionage
De Sitter develops an expanding relativistic cosmological solution without matter, influencing later debate over cosmic expansion
De Sitter finds a relativistic cosmological solution that later becomes important in expanding universe models
De Sitter develops a solution of Einstein's equations containing a cosmological constant, demonstrating that cosmic behaviour can be strongly affected by vacuum-like geometry.
Develops a relativistic cosmological model with repulsive expansion-like behaviour.
This page is generated from stored World History Database records matching the exact country and year shown above. Exact duplicate display records are collapsed. Records without a month are listed after the monthly sections. Source provenance varies by record; formal academic citation should be checked against the relevant primary source, archive or specialist historical reference.