30 May – The Hambacher Fest, a demonstration for civil liberties and national unity, ends with no result.
15 December – The CGS system goes back to a proposal in 1832 by the German mathematician Carl Friedrich Gauss to base a system of absolute units on the three fundamental units of length.
Undated
The first Baedeker guidebook, Voyage du Rhin de Mayence à Cologne, is published in Koblenz.
Publication begins (posthumously) of Carl von Clausewitz's Vom Kriege ("On War").
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