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'''''Gnomon Chronicles''''' is a work of [[fiction (nonfiction)|fiction]] and [[nonfiction (nonfiction)|nonfiction]] by [[Karl Jones (nonfiction)]]. | '''''Gnomon Chronicles''''' is a work of [[fiction (nonfiction)|fiction]] and [[nonfiction (nonfiction)|nonfiction]] by [[Karl Jones (nonfiction)]]. | ||
== Are You Sure ... == | == Are You Sure ... == | ||
Revision as of 06:02, 7 April 2020
Gnomon Chronicles is a work of fiction and nonfiction by Karl Jones (nonfiction).
Are You Sure ...
... that the first known calculation of the golden ratio, expressed inversely as a decimal of "about 0.6180340", was written in 1597 by astronomer and mathematician Maestlin in a letter to Johannes Kepler?
On This Day in History and Fiction: September 30
1550: Astronomer and mathematician Michael Maestlin born. He will be a mentor to Johannes Kepler, and play a sizable part in his adoption of the Copernican system.
1882: Thomas Edison's first commercial hydroelectric power plant (later known as Appleton Edison Light Company) begins operation on the Fox River in Appleton, Wisconsin, United States.
1913: Mathematician Samuel Eilenberg born. He will co-found category theory with Saunders Mac Lane, and propose the Eilenberg swindle (a construction applying the telescoping cancellation idea to projective modules).
Permalink: September 30
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