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Cross Staff & Back Staff Geocoin 🧭 Cross Staff & Back Staff Geocoin

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team-bison66 Send Message to Owner Message this owner
Thursday, 30 April 2020
Nordrhein-Westfalen, Germany
Recently Spotted:
In the hands of the owner.

This is collectible.

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Current Goal

Only to discover.

About This Item

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

  • 01-05 of 05 records ·
  • 01
Discovered It 12/22/2020 little-leggs discovered it   Visit Log

Discovered by " My eye's Only "
Thank you to
For sharing this one and some with Me here in sunny




Move To Collection 05/10/2020 team-bison66 moved it to their collection   Visit Log
Visited 05/06/2020 team-bison66 took it to Die Genialheit 🎵 Nordrhein-Westfalen, Germany   Visit Log
Discovered It 05/05/2020 Killekalle discovered it   Visit Log

Diese tolle Coin konnte ich heute beim Owner bewundern.

Gruß an team-bison66 und vielen Dank fürs Zeigen.

Discovered It 05/01/2020 PhilFeld273 discovered it   Visit Log

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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  • 01-05 of 05 records ·
  • 01

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