The History of the Nautical Sextant: From Navigation to Display Piece

An Instrument That Shaped the World

Before GPS, before radio navigation, before any of the digital tools we take for granted today, sailors crossing vast oceans relied on a single brass instrument to know exactly where they were on the face of the earth: the sextant.

Few scientific instruments have had a greater impact on human history. The sextant made global trade, exploration, and empire possible. And today, it occupies a place of honor in the collections of history enthusiasts, maritime lovers, and design-conscious decorators around the world.

Origins: The Problem of Longitude

For centuries, navigators could determine their latitude — their north-south position — by measuring the angle of the sun or stars above the horizon. But longitude, their east-west position, remained maddeningly elusive. Ships were lost, cargoes destroyed, and lives ended because of this single gap in navigational knowledge.

The solution came in stages. In 1731, John Hadley in England and Thomas Godfrey in America independently invented the octant — a precursor to the sextant that could measure angles up to 90 degrees. By 1757, the design was refined into the sextant (from the Latin sextans, meaning one-sixth of a circle), capable of measuring angles up to 120 degrees with far greater precision.

How a Sextant Works

The genius of the sextant lies in its use of mirrors. By reflecting the image of a celestial body (the sun, moon, or a star) down to the horizon, a navigator could measure the precise angle between the two. Combined with an accurate chronometer showing Greenwich Mean Time, this angle could be converted into an exact position on the globe.

The process — called celestial navigation or taking a sight — required skill, practice, and a steady hand. Master navigators could fix their position to within a mile or two, even after weeks at sea.

The Golden Age of the Sextant

From the late 18th century through the mid-20th century, the sextant was the indispensable tool of every serious navigator. Naval officers, merchant captains, and explorers all carried them. Famous voyages — Cook's circumnavigation, the charting of the Australian coastline, the crossing of the Atlantic — were made possible by skilled use of this instrument.

The finest sextants were made by legendary instrument makers: Heath & Co., Husun, Tamaya, and C. Plath among them. Their instruments were crafted from brass, silver, and later aluminum, with hand-ground mirrors and precision-engraved arcs. Many of these antique sextants survive today in remarkable condition — a testament to the quality of their construction.

The Sextant as a Collector's Piece

With the advent of electronic navigation in the latter half of the 20th century, the sextant's practical role diminished — though it is still taught in naval academies and carried as a backup on ocean-going vessels. But its cultural and aesthetic value has only grown.

Today, a well-crafted sextant is one of the most striking display pieces a collector can own. It carries centuries of history in its brass fittings, its mirrored arc, and its fitted mahogany case. It asks to be picked up, examined, and wondered at.

Browse our Sextants Collection to find a piece that brings this history into your home or office. Pair it with a compass from our Nautical Collection or a Porthole Mirror for a cohesive maritime display that tells a story.

Displaying Your Sextant

A sextant deserves a display that honors its heritage:

• Open case display: Leave the sextant in its fitted wooden case, lid open, on a shelf or sideboard. The contrast of brass against velvet or felt is visually striking.
• Standalone on a stand: A purpose-built instrument stand elevates the sextant as a sculptural object, allowing it to be viewed from all angles.
• Grouped with other nautical instruments: A compass, a telescope, a ship's chronometer, and a sextant together create a powerful tableau of the Age of Exploration.
• Lighting: Warm, directional lighting (a small spotlight or picture light) brings out the depth and warmth of brass beautifully.

The sextant is more than a collectible — it's a piece of the story of how humanity learned to navigate the world. Add one to your collection and bring that story home.