Concept
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Astronomy
Heliocentric model of the solar system, Nicolas Copernicus, De revolutionibus, p. 9, from an original edition, currently at the Jagiellonian University in Cracow, Poland.
Copernicus was a polyglot and polymath who obtained a doctorate in canon law and also practiced as a physician, classics scholar, translator, governor, diplomat, and economist. In 1517 he derived a quantity theory of money – a key concept in economics – and in 1519 he formulated a version of what later became known as Gresham's law (also in economics).
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"De Revolutionibus manuscript p9b."
http://en.wikipedia.org/wiki/File:De_Revolutionibus_manuscript_p9b.jpg
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Public domain.