18th century illustration showing a backstaff or English quadrant. 1776. The backstaff is a navigational instrument that was used to measure the altitude of a celestial body, in particular the sun or moon

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18th century illustration showing a backstaff or English quadrant. 1776. The backstaff is a navigational instrument that was used to measure the altitude of a celestial body, in particular the sun or moon

5311564 18th century illustration showing a backstaff or English quadrant. 1776. The backstaff is a navigational instrument that was used to measure the altitude of a celestial body, in particular the sun or moon. When observing the sun, users kept the sun to their back (hence the name) and saw the shadow cast by the upper vane on a horizon vane. It was invented by the English navigator John Davis who described it in his book Seaman's Secrets in 1594; (add.info.: Date: 1776); Universal History Archive/UIG

Media ID 38358784

© Universal History Archive/UIG / Bridgeman Images

1594 1776 Altitude Measure Moonlight Navigation Navigator Observing Seaman Secrets Shadow Vane Weather Vane Weather Vanes Weathercock Weathervane Weatherwane Wind Vane

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EDITORS COMMENTS
This stunning 18th century illustration captures the intricate design of a backstaff or English quadrant, a navigational instrument used by sailors to measure the altitude of celestial bodies such as the sun or moon. Invented by the English navigator John Davis and described in his book Seaman's Secrets in 1594, this tool played a crucial role in guiding ships across vast oceans during a time when navigation was both an art and a science. The image showcases the elegant craftsmanship of the backstaff, with its two vanes carefully aligned to cast shadows that allowed sailors to determine their position at sea. The user would keep the sun to their back while observing the shadow cast on a horizon vane, providing them with essential information for plotting their course. As we gaze upon this historical artifact frozen in time, we are reminded of the ingenuity and skill of those who came before us. This print serves as a window into an era where exploration and discovery were paramount, and where tools like the backstaff were indispensable companions on daring voyages into uncharted waters. It is truly a testament to human curiosity and perseverance in unlocking the mysteries of our world.

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