Pedro Nunes and the Retrogression of the Sun

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Title: Pedro Nunes and the Retrogression of the Sun
Authors: Lynch, Peter
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Date: 2018
Online since: 2020-01-17T16:07:03Z
Abstract: In northern latitudes we are used to the Sun rising in the East, following a smooth and even course through the southern sky and setting in the West. The idea that the compass bearing of the Sun might reverse seems fanciful. But that was precisely what Portuguese mathematician Pedro Nunes showed in 1537. Nunes made an amazing prediction: in certain circumstances, the shadow cast by the gnomon of a sun dial moves backwards.
Type of material: Journal Article
Publisher: Irish Mathematical Society
Journal: Bulletin of the Irish Mathematical Society
Volume: 81
Start page: 23
End page: 30
Copyright (published version): 2018 Irish Mathematical Society
Keywords: Astronomical phenomenaSolar retrogression
Subject LCSH: Nuñes, Pedro, 1502-1578
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Language: en
Status of Item: Peer reviewed
Appears in Collections:Mathematics and Statistics Research Collection

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