Mariner's Astrolabe Geocoin
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Owner:
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sonderzug
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Released:
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Wednesday, February 25, 2009
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Origin:
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Berlin, Germany
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Recently Spotted:
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In the hands of the owner.
This is collectible.
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This is a personal geocoin. It travels with me for tracking my steps.
![Mariner's Astrolabe Geocoin [copper]](https://img.geocaching.com/track/display/1e174602-03a2-4b59-9372-374660bf86d2.jpg)
How to use it: Taking a latitude reading from the North Star, Polaris: 1. Grasping the ring, hold the astrolabe up in the air towards the North Star. 2. Line up the holes in the spinning alidade so that you can see Polaris through them. 3. Take the reading from the degree scale and you now have your latitude. Measuring the declination of the sun: 1. Grasping the top ring, hold the astrolabe to about chest high. Holding Mariner's Astrolabe at about chest high for a sun declination reading 2. Looking down on the alidade, let the sun shine directly though the upper alidade hole. 3. Adjust the alidade so that the beam of sunlight shinning through the upper hole passes through the lower hole. The picture below shows how the light and shadow from the upper alidade look when slightly misaligned with the lower alidade hole. 4. Now you can take a reading from the degree scale and see the declination of the sun. When using the Mariner's Astrolabe Geocoin™ for navigation, you will want to take a reading at high noon. *Warning* Never look directly at the sun. Sighting the sun directly though the holes into your eye can cause blindness.
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