Sextant Sentence Examples
We have a sextant which I used to use every week for practice.
Measure the altitude of Polaris above the northern horizon, using the sextant.
Zacli published Tables of the Sun (Gotha, 1792; new and improved edition, ibid., 1804), and numerous papers on geographical subjects, particularly on the geographical positions of many towns and places, which he determined on his travels with a sextant.
In the case to the side are many instruments including the first sextant, made by John Bird in about 1757.
This was rapidly developed into the modern marine sextant.Advertisement
He also invented a reflecting sextant for observing the distance between the moon and the fixed stars, - the same in every essential as the instrument which is still in everyday use at sea under the name of Hadley's quadrant.
No further practical advance appears to have been made in the design or construction of the instrument till the year 1723, when John Hadley (best known as the inventor of the sextant) presented to the Royal Society a reflecting telescope of the Newtonian construction, with a metallic speculum of 6-in.