sextantes

The sextant is a navigational instrument used to measure the angle between any two visible objects. Its primary use is to determine the angle between a celestial body (such as the sun, moon, or star) and the horizon, which can then be used to calculate latitude. The sextant consists of a frame with a curved arc, typically graduated in degrees, and a small mirror called the index arm. The index arm can be rotated to align with the horizon or another reference point, while the curved arc reflects the image of the celestial body. The angle between the two images is then read off the arc.

The sextant was invented in the 18th century and has since become an essential tool for navigation at sea. It is particularly useful in areas where other navigational aids, such as GPS, are not available or reliable. The sextant is also used in astronomy for measuring the positions of stars and other celestial objects. Its simplicity, reliability, and accuracy have made it a staple in navigation for centuries. Despite the advent of modern technology, the sextant remains a valuable tool for mariners and astronomers alike.