Mariner's Astrolabe Geocoin JohnnyM.'s Astrolabe Geocoin

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Owner:
JohnnyM. Send Message to Owner Message this owner
Released:
Monday, February 2, 2009
Origin:
Czechia
Recently Spotted:
In the hands of the owner.

This is collectible.

Use TB2V1D6 to reference this item.

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Current Goal

To be in small collection of my owner.
I want to travel from event to event with my owner.
You can see me in the hands of JohnnyM. mostly stays in Prague (Czech Republic).

About This Item

astrolabe


How to use me:

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.


  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. In this example, the degree scale shows the sun is at 11 degrees. These example photographs show the angle of the sun during the evening to give better contrast of the sunlight passing though the hole. When using the Mariner's Astrolabe Geocoin™ for navigation, you will want to take a reading at high noon.

Gallery Images related to JohnnyM.'s Astrolabe Geocoin

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Tracking History (474.7mi) View Map

Discovered It 2/29/2024 ost-europäer discovered it   Visit Log

Vielen Dank fürs Zeigen sagt der Ost-Europäer.
Discovered It 1/28/2024 onkelb discovered it   Visit Log

Discovered when I view a youtube film regarding Maze event.
Discovered It 1/7/2024 Jessica07 discovered it   Visit Log

Thank s for sharing.
Discovered It 1/7/2024 marsso discovered it   Visit Log

Discovered it. Thank you for sharing.
Discovered It 10/24/2023 davidandry discovered it   Visit Log

Abbiamo scoperto questo codice assieme a molti altri al mega event Austriaco in Pitztal. Grazie per averlo condiviso !!
Discovered It 10/3/2023 Domout discovered it   Visit Log

TRACKABLES IN THE MAZE
Vu au Maze de Prague, j'ai retrouvé la liste dans ma valise 😊
Dunkerque, Hauts de France
Discovered It 7/20/2023 FroJer discovered it   Visit Log

Discovered it. Thank you for sharing.
Discovered It 7/20/2023 FroJer discovered it   Visit Log

Discovered it. Thank you for sharing.
Discovered It 7/14/2023 choupinette83 discovered it   Visit Log

Croisé au giga de prague
Discovered It 7/11/2023 britispriti discovered it   Visit Log

Heute mal ein wenig Ordnung in den Fotoordner gebracht und dabei noch den einen und anderen TB entdeckt

Danke für´s Zeigen sagen britispriti
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