Terminology from the Age of Sail

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Search result for definition: cross staff
Cross Staff: A relatively accurate tool used in celestial navigation since the early 16th century, it consisted of a scaled wooden staff or rod with one or more sliding perpendicular 'transoms' with which the angle between a celestial object such as the sun or moon and the horizon could be measured (altitude). Later often replaced by the more usable but somewhat less accurate backstaff or quadrant.
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