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 5/18/2022 Angelorum discovered it   Visit Log

Thanks
Discovered It 5/18/2022 amanka discovered it   Visit Log

viděno na GIGA
Discovered It 5/18/2022 Zouwinka + R discovered it   Visit Log

Parádní kousek spatřen na GIGA.
Discovered It 5/18/2022 Duo Baculi discovered it   Visit Log

Hey, dich durften wir in Prag beim GIGA betrachten - gute Reise!
Discovered It 5/18/2022 Ziarno discovered it   Visit Log

Please visit my instagram blog @geocaching_emperor where I post my gc finds :) Beware of spoilers! :) https://www.instagram.com/geocaching_emperor

Seen on Giga Prague/ Widziany na Giga w Pradze
Discovered It 5/18/2022 mikedo58 discovered it   Visit Log

Seen at the GIGA event in Prague.
Discovered It 5/18/2022 EBSSgeo discovered it   Visit Log

Beim Besuch des GPS Maze in Prag habe ich diesen heute entdecken können.
Discovered It 5/18/2022 Kubys1 discovered it   Visit Log

Discovered during our visit in MAZE Exhibit in Prague
Thanks for sharing
Discovered It 5/18/2022 Aďur_07 discovered it   Visit Log

Discovered
Discovered It 5/18/2022 purple_team discovered it   Visit Log

Discovered during our visit in MAZE Exhibit in Prague
Thanks for sharing
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