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Sextant reputed to have been used on James Cook’s third voyage to the Pacific (1776-1780),...

IMAGE number
MMM7295421
Image title
Sextant reputed to have been used on James Cook’s third voyage to the Pacific (1776-1780), c.1770 (brass)
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Artist
Ramsden, Jesse (1735-1800) / English
Location
National Maritime Museum, London, UK
Medium
brass
Date
c. 1770 AD (C18th AD)
Dimensions
42.5x44.5x9.5 cms
Image description

Developed from the more limited octant in the 1750s, the sextant could be used either to find the height of the Sun above the horizon to determine a ship’s latitude, or measure angles between the Moon and fixed stars. The latter was a more difficult observation to do accurately on a moving vessel but, using published tables, allowed a skilled navigator to calculate his longitude as well.

Photo credit
© National Maritime Museum, Greenwich, London / Bridgeman Images
Additional Credit Information
Acquired with the assistance of the National Heritage Memorial Fund.
Image keywords
18th century / colour / exploration / tool / measure / weights and measures / metal / navigator / object

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Usage restrictions from our Content Partners
Not available to clients invoiced in the UK
Largest available format 4623 × 4800 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 4623 × 4800 px 391 × 406 mm 830 KB
Medium 986 × 1024 px 83 × 87 mm 323 KB

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