Time and Time-Tellers

Name: Time and Time-Tellers
Rating: 3.96
ISBN: 9781332036585

ISBN: 9781332036585 出版年：2016 页码：199 James W Benson Forgotten Books

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The plane of every dial represents the plane of some great circle on the earth, and the Gnomon the earth's axis; the vertex of a right Gnomon, the centre.

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