February 26th, 2011
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February 26th, 2011
Barbara Ellmerer
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February 25th, 2011
Determing the circumference of the earth by measuring the different angles of a star appearing above Bale and Cologne. Sebastian Münster, Cosmographia (Basel: Henricus Petrus, 1544), Zentralbibliothek Zürich, Alte Drucke und Rara, Res 121, p. 5.
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February 24th, 2011
Judith Albert
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February 24th, 2011
Barbara Ellmerer
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February 22nd, 2011
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February 21st, 2011
Protocompass (swimming), Petrus Peregrinus (possibly around 1269), Epistula de magnete*, Fig. 1, Detail (p. 83).
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February 18th, 2011
Judith Albert
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February 17th, 2011
Barbara Ellmerer
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February 16th, 2011
Judith Albert
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