What is a Sextant and How to use a Sextant?

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What is a Sextant? Well it is an instrument used for celestial navigation by determining the angle between the horizon and a celestial body like Sun, the Moon, or a star. It determines latitude and longitude which helps in navigations.

The device has an arc of a circle with marking of degrees, and a movable radial arm at the centre of the circle. A telescope is also mounted on it which is lined up with the horizon. On the radial arm there is a mirror in which reflection of the star is seen through the telescope, to coincide with the horizon.