27/08/2026
โ THE SEXTANT โ Essential Navigational Instrument ๐ข
The sextant is one of the most important traditional instruments in marine navigation. It allows a navigator to measure the angular altitude of celestial bodies such as the Sun, Moon, planets, and stars above the horizon, supporting celestial navigation at sea.
๐น Measures the angle between a celestial body and the horizon
๐น Uses an index mirror and horizon glass to bring the celestial body and horizon into alignment
๐น Telescope provides accurate sighting of the celestial body
๐น Graduated arc and vernier allow precise angle measurement
๐น Micrometer drum and tangent screw provide fine adjustment
๐น Shade glasses help protect the eye and improve observation in bright conditions
๐น Celestial observations can be used to determine the vesselโs position
โ ๏ธ Proper sextant handling, accurate horizon selection, correct instrument reading, and careful observation are essential for reliable celestial navigation. Even with modern electronic navigation systems, understanding traditional celestial navigation remains valuable seamanship knowledge.
A sextant is more than an instrumentโit represents the navigatorโs ability to find position using the sky and the sea.