Reading Errors in Sundials with Incorrect Hour Lines: The Seventeenth-Century Sundial in Lerma

Reading Errors in Sundials with Incorrect Hour Lines: The Seventeenth-Century Sundial in Lerma Nexus Netw J https://doi.org/10.1007/s00004-018-0387-7 RESEARCH Reading Errors in Sundials with Incorrect Hour Lines: The Seventeenth-Century Sundial in Lerma Martı´n Perea-Alvarez de Eulate 2 1 Gloria Del Rı´o-Cidoncha Francisco Montes-Tubı´o Kim Williams Books, Turin 2018 Abstract The restoration project of a seventeenth century sundial at Lerma (Spain) with incorrect engraved marks for the hour lines and devoid of its gnomon raised the issue of whether it is possible to predict what might be the reading errors when providing a new gnomon for it. Moreover, the analysis of possible slight changes in gnomon’s orientation and/or geometrical features to get better precisions was an appealing challenge. We must consider that Lerma’s case is not unique: templates were used in the past to engrave marks in numerous dials, and small differences in orientation were not taken into account. Differences in latitude under 0.5 were also neglected, by rounding off to integer values. Although Lerma’s sundial has been our guiding thread and its results are presented in detail, the method can be extrapolated to calculate reading errors for any dials with wrong marks for orientation or latitude different form the actual ones. Keywords Sundials  Gnomons  Solar hours Electronic supplementary material The online http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nexus Network Journal Springer Journals

Reading Errors in Sundials with Incorrect Hour Lines: The Seventeenth-Century Sundial in Lerma

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Publisher
Springer International Publishing
Copyright
Copyright © 2018 by Kim Williams Books, Turin
Subject
Mathematics; Mathematics, general; History and Philosophical Foundations of Physics; Popular Science, general; History, general
ISSN
1590-5896
eISSN
1522-4600
D.O.I.
10.1007/s00004-018-0387-7
Publisher site
See Article on Publisher Site

Abstract

Nexus Netw J https://doi.org/10.1007/s00004-018-0387-7 RESEARCH Reading Errors in Sundials with Incorrect Hour Lines: The Seventeenth-Century Sundial in Lerma Martı´n Perea-Alvarez de Eulate 2 1 Gloria Del Rı´o-Cidoncha Francisco Montes-Tubı´o Kim Williams Books, Turin 2018 Abstract The restoration project of a seventeenth century sundial at Lerma (Spain) with incorrect engraved marks for the hour lines and devoid of its gnomon raised the issue of whether it is possible to predict what might be the reading errors when providing a new gnomon for it. Moreover, the analysis of possible slight changes in gnomon’s orientation and/or geometrical features to get better precisions was an appealing challenge. We must consider that Lerma’s case is not unique: templates were used in the past to engrave marks in numerous dials, and small differences in orientation were not taken into account. Differences in latitude under 0.5 were also neglected, by rounding off to integer values. Although Lerma’s sundial has been our guiding thread and its results are presented in detail, the method can be extrapolated to calculate reading errors for any dials with wrong marks for orientation or latitude different form the actual ones. Keywords Sundials  Gnomons  Solar hours Electronic supplementary material The online

Journal

Nexus Network JournalSpringer Journals

Published: Jun 4, 2018

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