Illustration by German scientist Petrus Apianus, aka Peter Apian, born in Saxony on April 16, 1495. A mathematician, astronomer, and cartographer, he was a favorite of Charles V of the Holy Roman Empire. In 1540, Apian created Astronomicum Caesareum and dedicated it to his imperial benefactor. It was a sumptuous Renaissance instructive manual that explained, in part, how to use an astrolabe to calculate the altitude of the stars and planets.

Illustration by German scientist Petrus Apianus, aka Peter Apian, born in Saxony on April 16, 1495. A mathematician, astronomer, and cartographer, he was a favorite of Charles V of the Holy Roman Empire. In 1540, Apian created Astronomicum Caesareum and dedicated it to his imperial benefactor. It was a sumptuous Renaissance instructive manual that explained, in part, how to use an astrolabe to calculate the altitude of the stars and planets.

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    Illustration by German scientist Petrus Apianus, aka Peter Apian, born in Saxony on April 16, 1495. A mathematician,...
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