Ships, Clocks, and Stars : Ships, Clocks, and Stars (9780062357175) by Dunn Richard; Higgitt Rebekah

Author:Dunn, Richard; Higgitt, Rebekah
Language: eng
Format: epub
Publisher: HarperCollins
Published: 2014-08-13T00:00:00+00:00

His certainty came from having used thirty-four sets of lunar observations to establish its position.

Fixing geographical locations accurately was a lengthy process, since the best observations could only be made when there was time to erect an observatory for the larger clocks and telescopes (Fig. 9). The stability of land did, though, mean that the astronomers could carry out observations that were impossible at sea, including observations of Jupiter’s satellites in order to fix longitudes. It was also an opportunity to check the watches against the observatory instruments. However, being able to fix longitude from a ship meant that the large instruments, though more accurate, were not the only means of fixing positions with some certainty. As Lieutenant James King noted during the third voyage,

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