This adaptation of the traditional marine sextant allowed navigation without visual reference to the real horizon.
2.
This is a didactic animation to illustrate the use of the marine sextant to measure the Altitude ( astronomy ) of the Sun at sea.
3.
His next commands after the " Bellona " were the John Bird, commissioned by the Board of Longitude, produced an instrument taking up both suggestions, a sextant of 20 inches radius with a brass frame and 1 / 3 the weight of the reflecting circle, which served as a prototype of the marine sextant still used today.
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