Influence of chronometer error uncertainties on the Longitude of Shackleton's vessel, Endurance

Abstract In 1915 while the Imperial Trans-Antarctic Expedition's vessel Endurance was icebound in the Weddell Sea, lunar occultation timings were carried out in order to rate the chronometers and thereby find longitude. The original observations have been re-analysed using modern lunar ephemeri...

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Bibliographic Details
Published in:Journal of Navigation
Main Authors: Bergman, Lars, Mearns, David L., Stuart, Robin G.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2022
Subjects:
Ocean Engineering
Oceanography
Antarctic
Weddell
Weddell Sea
Antarc*
Online Access:http://dx.doi.org/10.1017/s0373463322000649
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0373463322000649
Description
Summary:Abstract In 1915 while the Imperial Trans-Antarctic Expedition's vessel Endurance was icebound in the Weddell Sea, lunar occultation timings were carried out in order to rate the chronometers and thereby find longitude. The original observations have been re-analysed using modern lunar ephemerides and catalogues of star positions. The times derived in this way are found to differ by an average of 20 s from those obtained during the expedition using positions given from the Nautical Almanac and introduces an additional offset of the true positions to the east of those recorded in the log.

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