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'Taking a Lunar Distance', 1891

IMAGE number
UIS5096710
Image title
'Taking a Lunar Distance', 1891
Auto-translated text View Original Source
Location
Science Museum, London, UK
Medium
engraving
Image description

Taking a Lunar Distance', 1891. Engraving showing a naval officer measuring the position of the Moon with respect to the fixed stars from the deck of a ship at sea. Using a sextant, a navigational instrument, the sailor would be able to accurately determine the angle between certain stars and the lunar limb. With this measurement it was possible using the Nautical Almanac (navigational ephemeris) to calculate one's longitude at sea. Known as the 'Lunar Method' this technique required hours of mathematical calculations to be successful. From 'The Midnight Sky: Familiar Notes on the Stars and Planets' by Edwin Dunkin (1821-1898), a popular account of the stars and planets published in 1891. Dunkin was chief assistant at the Royal Observatory, Greenwich. ©SSPL/Science Museum

Photo credit
SSPL/UIG / Bridgeman Images
Image keywords
19th century

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Not available to clients invoiced in the UK
Largest available format 3504 × 3162 px 3 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3504 × 3162 px 297 × 268 mm 2.8 MB
Medium 1024 × 924 px 87 × 78 mm 1.3 MB

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