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Detailed explanation-1: -sextant, instrument for determining the angle between the horizon and a celestial body such as the Sun, the Moon, or a star, used in celestial navigation to determine latitude and longitude. The device consists of an arc of a circle, marked off in degrees, and a movable radial arm pivoted at the centre of the circle.

Detailed explanation-2: -Sextant can be used to measure vertical angles. Explanation: Sextant involves in the measurement of both vertical and horizontal angles. It consists of a movable arm by which the readings can be taken.

Detailed explanation-3: -What is Sextant? The sextant is an instrument used to measure angles. Mainly used at sea, the tool is so named because its arc is one-sixth of a circle – 60 degrees. It adheres to the principle of double reflection hence it can measure angles up to 120 degrees.

Detailed explanation-4: -All it is is a device that measures the angle between two objects. The sextant makes use of two mirrors. With this sextant, one of the mirrors ( mirror A in the diagram) is half-silvered, which allows some light to pass through. In navigating, you look at the horizon through this mirror.