This image is not available for purchase in your country.

Engraving of a sextant designed by John Hadley

Engraving of a sextant designed by John Hadley

R102/0099

Rights Managed

This image is not available for purchase in your country.

Please contact your Account Manager if you have any query.

Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Astronomical sextant. Historical artwork of an astronomical sextant designed by John Hadley (1682-1744) in about 1730. Sextants were used for measuring the angle of an object, usually the Sun, above the horizon. This was achieved through the use of two mirrors, one of which was fixed. The second mirror was moved until the two images of the object matched up. The angle can then be read from the curved scale (at bottom) to which the moveable mirror was attached. From this the latitude, which was vital for ship navigation, can be calculated.

Release details

Model release not required. Property release not required.

 {{ i.shot_duration ? i.shot_duration + ' ' : '' }}{{ i.shot_uhd ? '4K ' : i.hires ? 'HD ' : '' }}{{ i.spl_number }} R{{ i.license }}

  • Add to board
  • Similar {{ mediaType(i) }}