Sextants

Sextants

A sextant is a navigational instrument used to determine the angle between two objects, typically the horizon and a celestial body such as the sun or stars. It consists of a graduated arc, a sighting mechanism, and a movable arm that carries a small telescope. The observer aligns the telescope with the celestial body and the horizon, and then reads the angle from the graduated arc. Sextants are commonly used in marine navigation, where they allow sailors to determine their position at sea by measuring the angle between the horizon and the sun or stars. The history of the sextant can be traced back to the 18th century, when it was developed as an improvement over the earlier quadrant and octant instruments. The sextant was more accurate and easier to use, and quickly became the preferred navigational instrument for sailors. Today, sextants are still used by some sailors and navigators, particularly in emergency situations where electronic navigation equipment may fail. In addition to its use in navigation, the sextant has also been used in astronomy to measure the position of stars and planets. It has also been used in surveying and mapping, where it can be used to measure angles between distant points. Overall, the sextant is a versatile and important instrument that has played a key role in navigation and exploration throughout history.

navigational instrument, marine navigation, celestial body, angle measurement, history

— Thomas Johnson

CITATION : "Thomas Johnson. 'Sextants.' Design+Encyclopedia. https://design-encyclopedia.com/define/sextants?E=396023 (Accessed on October 14, 2026)"