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 5/24/2022 toporki discovered it   Visit Log

Widziany w Pradze na Giga
Discovered It 5/23/2022 MIDOUL discovered it   Visit Log

🇨🇵🇨🇵🇨🇵 Thank for sharing from 🇫🇷🇨🇵🇨🇵

A Big GIGA, a Big GPS Maze, a Big Fest in Prague 2022

MIDOUL is very happy !!! Thank you !!!
Discovered It 5/23/2022 bentstor discovered it   Visit Log

Set til giga event i Prag. Tak for kigget
Discovered It 5/23/2022 DVERK discovered it   Visit Log

Auf unserer Tour zum GIGA in Prag oder zum MEGA GGE 2022 konnte ich diesen TB entdeckt. Danke fürs zeigen und teilen und weiterhin gute Reise. Lg Tom alias DVERK
Discovered It 5/23/2022 Zoya83 discovered it   Visit Log

Seen in prague
Discovered It 5/23/2022 Steffi1810 discovered it   Visit Log

Auf dem GPS Maze in Prag gesehen
Discovered It 5/23/2022 GeoTrotti discovered it   Visit Log

Discovered in Prag during Giga Weekend!
Discovered It 5/23/2022 GeoTrotti discovered it   Visit Log

PRAG war der Hammer... Endlich komme ich dazu, noch ein "paar" TBs zu discovern...
Some were discovered during GIGA weekend in Prague others seen in the hands of friends. I really enjoyed and very happy when I remember these days!
Discovered It 5/23/2022 Dariunee discovered it   Visit Log

Seen at the maze in the GIGA event, thanks for showing!!
Discovered It 5/22/2022 djgoub discovered it   Visit Log

Vu lors du giga
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