Quadrant Geocoin in Antique Bronze

Eine schöne Coin für die gemeinsame Sammlung der Familie Ruhrpott-Dachse (MrsDachs & Dachs71), da soll sie auch bleiben.

Andere Cacher dürfen sie gerne Discovern.

Die Quadrant Geocoin™ in Antik Bronze von www.compassrosegeocoin.com ist eines der besonderen Stücke für meine Geocoin-Sammlung.

Navigation früher und heute ist ein spannendes, lehrreiches und zugleich praktisch anwendbares Thema.

Die früheren mechanischen Navigationsinstrumente sind ein interessantes Thema, dass www.compassrosegeocoin.com gut in optisch schöne Geocoins umgesetzt hat. Vielen Dank.

Weitere Informationen zur Verwendung der Quadrant Geocoin findet man unter:

http://www.compassrosegeocoin.com/quadrant.php

Die Serie umfasst:

• Compass Rose Geocoin^™
• Cosmolabe Geocoin^™
• Cross Staff & Back Staff Geocoin^™
• Mariner's Astrolabe Geocoin^™
• Nocturnal Geocoin^™
• Planisphere Geocoin^™
• Quadrant Geocoin^™
• Sextant Geocoin^™
• Sextant Geopin^™
• Sextant Navigation Geocoin^™
• Universal Ring Dial Geocoin^™

www.compassrosegeocoin.com schrieb zu dieser Coin: Planisphere Geocoin™:

This is a functional quadrant coin which you can actually use to locate your latitude.

The quadrant was quite simple in its early days and had many functions added after it was refined by surveyors and navigators. The simple method is for you line up one straight side and aim it at the pole star Polaris. Then the weighted plumb string dangling down intercepting the arc would indicate the degree of latitude. A more complicated method is to measure the sun's altitude at high noon and then using a navigational almanac and a little math to yield your latitude during the day. Later it also included deviation information and tangent marks. You could measure the height and length of something, your latitude, and much more. Used in conjunction with a nocturnal, you could also calculate a more accurate reading of your latitude. The use of a planisphere is most helpful to find the correct star to use.

A nice feature of most quadrants is that navigators did not have to look directly into the sun to take a reading like was needed with the cross staff. Each of the two sights had a hole which you used to line up a beam of sunlight without looking though the sights. The quadrant design we made is based on a few different quadrants used in the 1300s; however, for manufacturing feasibility, the sights we have implemented are triangle points. Otherwise the holes would be too small for a quadrant this size.