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John Dee

geography
The Most Accurate Instruments of Gemma Frisius

The Most Accurate Instruments of Gemma Frisius

Harald Sack
On December 9, 1508, physician, mathematician, cartographer, philosopher, and instrument maker Gemma Frisius was born. He created important globes, improved the mathematical instruments of his day and applied mathematics in new ways to surveying and navigation. Gemma Frisius – Youth and Education Gemma Frisius was born Jemma Reinierzoon in Dokkum, Friesland, a coastal province in northern Netherlands, of poor parents who died when he was young. His nom de plume Gemma Frisius is a…
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philosophy
The Art of Hiding Information – Johannes Trithemius’ Steganography

The Art of Hiding Information – Johannes Trithemius’ Steganography

Harald Sack
On February 1, 1462, German Benedictine abbot and polymath Johannes Trithemius was born. Trithemius was active in the German Renaissance as a lexicographer, chronicler, cryptographer, and occultist. He had considerable influence on the development of early modern cryptography and modern occultism. However,  “Speak of things public to the public, but of things lofty and secret only to the loftiest and most private of your friends. Hay to the ox and sugar to…
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astronomy
Hans Lippershey and the Telescope

Hans Lippershey and the Telescope

Tabea Tietz
On October 2, 1608,  German-Dutch lensmaker Hans Lippershey applied to the States-General of the Netherlands for a patent for his instrument “for seeing things far away as if they were nearby”. Telescope History Even though scientists of the middle ages never heard of telescopes and most of them did not know specific laws of optics, they started laying the foundations for telescopes as we know them today. Before the invention of the telescope…
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astronomy
John Dee and his World of Science and Magic

John Dee and his World of Science and Magic

Harald Sack
On July 13, 1527, Welsh mathematician, astronomer, astrologer, occultist, navigator, imperialist and consultant to Queen Elizabeth I, John Dee was born. He is considered one of the most learned men of his age. Besides being an ardent promoter of mathematics and a respected astronomer, in his later years he immersed himself in the worlds of magic, astrology and Hermetic philosophy. One of his aims was attempting to commune with angels in order to…
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