Exploring Johannes Kepler's 'Somnium' – one of the first science fiction stories

Footnote a

Rudolph II, Holy Roman Emperor from 1576 to 1612 and the elder brother of Matthias, Archduke of Austria and Holy Roman Emperor from 1612 to 1619. The Habsburg princes Rudolph and Matthias didn’t get on. Matthias became HRE when Rudolph died.

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