Willem de Sitter was a Dutch mathematician, physicist, and astronomer.
Willem de Sitter
Einstein, Ehrenfest, Willem de Sitter, Eddington, and Lorentz in Leiden (1923)
Sneek is a city southwest of Leeuwarden and the seat of the former municipality of Sneek in the province of Friesland, Netherlands. As of 2011 it is the seat of the municipality of Súdwest-Fryslân. The city had approximately 33,855 inhabitants in January 2017.
Waterpoort
Sneek from the air (2022)
Waterpoort (2017)
Kleinzand Canal in Sneek (2006)