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 5/22/2022 djgoub discovered it   Visit Log

Vu lors du giga
Discovered It 5/22/2022 Cache-Michl discovered it   Visit Log

Seen at the maze to the giga event in prague. Thanks for showing.
Discovered It 5/22/2022 Vlsilhavy discovered it   Visit Log

Prohlédnuto během GIGAeventu. Díky.
Discovered It 5/22/2022 Chrom Juwel discovered it   Visit Log

:)
Discovered It 5/22/2022 Turako discovered it   Visit Log

Seen at the Giga Event Prague 2022
Gesehen am Giga Event in Prag
Discovered It 5/22/2022 Chrom Juwel discovered it   Visit Log

:)
Discovered It 5/22/2022 Majka162 discovered it   Visit Log

Viděla jsem během víkendu na gigaeventu Praha 202(2) na oslavách 20-ti let geocachingu.
Děkuji za ukázání.
I saw during the weekend at the gigaevent Prague 202 (2) at the celebrations of 20 years of geocaching .
Thank you for sharing.
Discovered It 5/22/2022 Lilioneth discovered it   Visit Log

Objeven na gigaeventu v Praze při oslavě 20 let geocachingu. Děkuji za ukázání.
Discovered It 5/21/2022 søttrup discovered it   Visit Log

Seen at the Maze at the Giga event in Prague. Thanks for the view.
Discovered It 5/21/2022 Hesiodus discovered it   Visit Log

Seen in the Maze, thanks for showing!
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