An octant designed by Hadley, c 1730.

An octant designed by Hadley, c 1730.
3 4 c m
actual image size: 32cm x 26cm


Early example of an octant designed by Hadley in about 1730. An octant is used in surveying and in navigation to measure the angle between two objects. Octants were used by navigators to determine a ship's latitude by measuring the angle between the horizon and a celestial body, such as the Sun.

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© Science Museum / Science & Society Picture Library

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