🧭 Cross Staff & Back Staff Geocoin
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Owner:
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team-bison66
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Released:
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Thursday, April 30, 2020
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Origin:
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Nordrhein-Westfalen, Germany
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Recently Spotted:
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In the hands of the owner.
This is collectible.
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A very early navigational instrument, the cross staff was widely used among surveyors and astronomers. It was not until the 1500s after it was developed further that it started to be used at sea.
The name is derived from its cross shape. It was cumbersome to use simply because a user had to focus on the horizon and star or sun at the same time; moving your eyes from one to the other and at the same time sliding the transversal (cross piece) until you achieved what you thought would be an accurate reading. It also required looking straight into the sun when taking daytime readings. It was with the invention of the back staff that these problems would be resolved.
John Davis invented a back staff in 1595 and his improved design became known as the Davis Quadrant. It rendered the cross staff obsolete since the user only had to take a sight at one object and didn't have to look at the sun to take a reading. Appropriately named, its basic design is like a cross staff, but with some enhancements. Daylight readings were taken by having your back towards the sun. In many cases, John Davis's invention ended up replacing not only the cross staff, but also the mariner's astrolabe and quadrant. It was in the late 1700s when the octant and sextant became the new preferred tools over the back staff.
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Tracking History () View Map
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little-leggs discovered it
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Discovered by " My eye's Only "
Thank you to
team-bison66
For sharing this one and some with Me here in sunny
SOMERSET
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😁
Little-leggs
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team-bison66 moved it to their collection
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team-bison66 took it to Die Genialheit 🎵
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Nordrhein-Westfalen, Germany
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Killekalle discovered it
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Diese tolle Coin konnte ich heute beim Owner bewundern.
Gruß an team-bison66 und vielen Dank fürs Zeigen.
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PhilFeld273 discovered it
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Eine weitere schöne Coin, die ich heute beim Owner entdecken konnte.
Mit einem Kreuzstab navigieren zu können, da gehört schon eine besondere Fähigkeit zu. Konnte man sich früher am Horizont, den Stern und der Sonne mit diesem Kreuzstab orientieren, so würden heute wohl die neuen Starlink-Satelliten schnell zur Ablenkung am Himmel führen.
Viele Grüße an team-biseon66 und danke fürs Zeigen. 😎
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