JohnnyM.'s Astrolabe Geocoin

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Owner:: JohnnyM. 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:

Grasping the ring, hold the astrolabe up in the air towards the North Star.

Line up the holes in the spinning alidade so that you can see Polaris through them.

Take the reading from the degree scale and you now have your latitude.

Measuring the declination of the sun:

Grasping the top ring, hold the astrolabe to about chest high.

Looking down on the alidade, let the sun shine directly though the upper alidade hole.

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.

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

5/20/2022	mOlier57 discovered it	Visit Log
🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷🇫🇷 Découvert lors de l’exposition GPS MAZE à Prague 2022 Merci pour le partage Salutations de France 🇫🇷 🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿🏴󠁧󠁢󠁥󠁮󠁧󠁿 Discovered at the GPS MAZE exhibition in Prague 2022 Thank you for sharing Greetings from France 🇫🇷 🇨🇿🇨🇿🇨🇿🇨🇿🇨🇿🇨🇿🇨🇿🇨🇿🇨🇿🇨🇿🇨🇿🇨🇿🇨🇿🇨🇿🇨🇿 Objeveno na výstavě GPS MAZE v Praze 2022 Děkuji za sdílení Zdravíme z Francie 🇫🇷 🇩🇪🇩🇪🇩🇪🇩🇪🇩🇪🇩🇪🇩🇪🇩🇪🇩🇪🇩🇪🇩🇪🇩🇪🇩🇪🇩🇪🇩🇪 Entdeckt auf der GPS MAZE Ausstellung in Prag 2022 Ich danke Ihnen für das Teilen Grüße aus Frankreich 🇫🇷
5/20/2022	flowo1985 discovered it	Visit Log
Wir haben Euch bzw Eure TBs letzte Woche beim GIGA in Prag gesehen. Danke fürs Zeigen und fröhliches Cachen! Grüße aus Bayreuth, Bayern, Deutschland, Europa, Erde 🌏 🤪
5/20/2022	rinaho discovered it	Visit Log
Seen in Giga/Maze, Prague
5/20/2022	LudvikK discovered it	Visit Log
S Bufo
5/20/2022	N.vagus discovered it	Visit Log
Diese Reisenden dürfte ich auf dem MAZE Event in Prag discovern. Danke für's Teilen.
5/20/2022	Grit_68 discovered it	Visit Log
Gesehen durch Giga /Maze Event in Prag Danke für Zeigen ;-) Viděno prostřednictvím akce Giga / Bludiště v Praze Díky za ukázku ;-) Seen through Giga /Maze event in Prague Thanks for showing ;-)
5/20/2022	skandal_illa discovered it	Visit Log
Seen somewhere during the Prague Giga 2020/2022, thank you for sharing!
5/20/2022	hracicka discovered it	Visit Log
Zahlédnuto na MAZE 2022 v Praze
5/20/2022	charvic73 discovered it	Visit Log
Viděno na GIGA eventu v Praze Díky za ukázku charvic73 Googletranslate: Seen at the GIGA event in Prague Thanks for the show charvic73
5/20/2022	charvic73 discovered it	Visit Log
Viděno na GIGA eventu v Praze Díky za ukázku charvic73 Googletranslate: Seen at the GIGA event in Prague Thanks for the show charvic73
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