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 5/21/2022 cachediversffm discovered it   Visit Log

In Prag Event 2022 gesehen

Discovered It 5/21/2022 Sug@r discovered it   Visit Log

Viděla jsem během víkendu na gigaeventu Praha 202(2) na oslavách 20-ti let geocachingu nebo v některých nedalekých keších. Děkuji za ukázání.
I saw during the weekend at the gigaevent Prague 202 (2) at the celebrations of 20 years of geocaching or in some nearby caches. Thank you for sharing.
Discovered It 5/21/2022 Hunt78fr discovered it   Visit Log

Discovered at Prague during the Giga Event, or side events. Thanks for sharing.
Discovered It 5/21/2022 agnes.fleur discovered it   Visit Log

Vue lors du Giga à Prague le 14-15 mai.
Merci pour le partage
Discovered It 5/21/2022 kasjopea discovered it   Visit Log

Discovered during GIGA event in and around Prague. Thank you for sharing.
Discovered It 5/21/2022 Hansern75 discovered it   Visit Log

Seen in Mega Prague. Thanks 🐸 Greetings from Norway 🇳🇴
Discovered It 5/21/2022 MHMTeam discovered it   Visit Log

Seen at the Giga-Event in Prague on Saturday :-)
Discovered It 5/20/2022 Staerneching discovered it   Visit Log

We have seen it on the GIGA Event in Prag.

Lovely Greetings from Switzerland and thanks for showing!
Discovered It 5/20/2022 ecki_DD discovered it   Visit Log

Auf dem GIGA Event in Prag konnten wir viele schöne Coins und TBs entdecken. Vielen Dank fürs zeigen!
Discovered it. Thank you for sharing.
Discovered It 5/20/2022 Marsha. discovered it   Visit Log

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