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 7/16/2022 H.E.R.A. discovered it   Visit Log

beim GIGA in entdeckt...
Discovered It 7/15/2022 DATO1 discovered it   Visit Log

Vielen Dank fürs Zeigen!
Discovered It 7/14/2022 chose80 discovered it   Visit Log

Danke für das Discovern. Dich habe ich an einem Event in Prag gesehen. Danke
Discovered It 7/13/2022 Yosx discovered it   Visit Log

Découvert sur le Giga de pragues . . . .
Discovered It 7/10/2022 casik4 discovered it   Visit Log

Discovered at the GPS Maze Prague....👍
Discovered It 7/4/2022 GauthierPellok discovered it   Visit Log

Vu dans la vidéo du Maze Europe 2015 sur YouTube. Merci pour le partage ! 🧭
Discovered It 7/4/2022 KleinDomie discovered it   Visit Log

Heute schaffe ich es endlich mal diverse Coins/Tbs zu discovern.
Wo hab ich die alle nur gesehen...also beim GIGA in Prag, beim MEGA in Klingenthal und beim MEGAin der Oberlausitz.
Ach ja, in Kroatien und so waren wir auch noch im Urlaub und haben da einiges in Logbüchern gefunden.
THX to all Owners for sharing!
Discovered It 7/4/2022 bregtje1988 discovered it   Visit Log

Tijdens het cachen deze trackable mogen discoveren.
Při ukládání do mezipaměti může tento sledovatelný objevit.
While caching this trackable may discover.
Discovered It 7/4/2022 nwpvr discovered it   Visit Log

Discovered at the GPS Maze Prague.
Discovered It 7/2/2022 viko76 discovered it   Visit Log

Danke fürs zeigen

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