Latitude observations on Galilee

Taking sextant readings on Galilee, [1906-08].
A sextant measures the angular distance between a celestial object and the horizon. Several observers take independent readings to ensure the accuracy of measurement. Similarly, more than one chronometer provides standard time. The Galilee carried a minimum of three chronometers and four sextants on its three scientific voyages.
Image: Carnegie Institution of Washington, Department of Terrestrial Magnetism.

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