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 5/20/2022 madmag66 discovered it   Visit Log

👍👍in Prag gesehen 👍👍🌶🌶🤟🤟
Discovered It 5/19/2022 Loup Silencieux discovered it   Visit Log

Découverte d'un bon nombre d'objets voyageurs...et de géocacheurs voyageurs, vu que certains codes étaient sur leurs vêtements...

MPLP
Discovered It 5/19/2022 Iceorchidee discovered it   Visit Log

Diesen tollen Coin/TB durfte ich heute am Event discovern und mit TBScan loggen.

Danke für's Zeigen

Iceorchidee 🪷 Katrin
Discovered It 5/19/2022 Dryjak discovered it   Visit Log

Thanks, discovered at GIGA Prague 14.5.2022
Discovered It 5/19/2022 Maloup discovered it   Visit Log

Vu au GIGA, merci pour ce partage
Discovered It 5/19/2022 Grotprof discovered it   Visit Log

Thanks, discovered at GIGA Prague
Discovered It 5/19/2022 DD_LL discovered it   Visit Log

⭕⭕⭕⭕

GIGA PRAG

Wir sagen Danke fürs zeigen des Trackable

DD_LL

⭕⭕⭕⭕
Discovered It 5/19/2022 boarderjenne discovered it   Visit Log

In Prag auf dem Giga gesehen!
Discovered It 5/19/2022 mikatini discovered it   Visit Log

Discovered it. Thank you for sharing.
Discovered It 5/19/2022 Vilík discovered it   Visit Log

Zahlédnuto na GIGA Eventu v Praze
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