Mariner's Astrolabe Geocoin MilanoXX's Mariner's Astrolabe Geocoin

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Owner:
milanoxx Send Message to Owner Message this owner
Released:
Wednesday, December 16, 2009
Origin:
Středočeský kraj, Czechia
Recently Spotted:
In the hands of the owner.

This is collectible.

Use TB32GNQ to reference this item.

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Current Goal

Mince bude navštevovat hezká místa a eventy. Od majitele se nehne ani na krok :)

About This Item

Mariner's Astrolabe

This huge geocoin is a working replica of a Mariners Astrolabe. The mariner's astrolabe, also called sea astrolabe, is not a proper astrolabe, but rather a graduated circle with an alidade used to measure vertical angles. In the sixteenth century, the instrument was also called a ring.

The mariner's astrolabe would have replaced or complemented instruments such as the cross staff or quadrant as a navigator's instrument. The mariner's astrolabe was used until the middle or, at the latest, the end of the 17th century. It was replaced by more accurate and easier-to-use instruments such as the Davis quadrant. In order to use the astrolabe, the navigator would hold the instrument by the ring at the top. This caused the instrument to remain in a vertical plane. He would align the plane of the astrolabe to the direction of the object of interest. The alidade was aligned to point at the object and the altitude was read off the outer degree scale.

How to use mariners astrolabe:

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.

Gallery Images related to MilanoXX's Mariner's Astrolabe Geocoin

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Tracking History (335.3mi) View Map

Discovered It 11/3/2010 pforda discovered it   Visit Log

To je teda discovered! Discovered bez dolicného...
Ale co se Krtoly týce, tak to jsem si zadyskavrila pekne. :)
Discovered It 10/28/2010 Jendaczech discovered it   Visit Log

Konecne se na nej dostalo.
Discovered It 10/28/2010 posterix discovered it   Visit Log

Nalezeno na druhý pokus. Pekná vecicka, snad by ve schránce mohla být aspon fotografie, aby každý hned videl o jak vyjímecný GC se jedná.
Discovered It 10/8/2010 leela.cz discovered it   Visit Log

Vydolovani mikra s cislickem ze skaly, kam zapadla, nam dalo docela zabrat 🙂. Tak snad dalsi lovci to budou mit o chlup jednodusi... Diky.
Discovered It 10/8/2010 bender.king-leela.cz discovered it   Visit Log

Krasny coin, diky.
Retrieve It from a Cache 9/18/2010 milanoxx retrieved it from Po Labi na lodi Ústecký kraj, Czechia   Visit Log

Po plavbe na kocábce z Ústí nad Labem do Litomeric se tešíme s majiteli na další event!
Dropped Off 9/18/2010 milanoxx placed it in Po Labi na lodi Ústecký kraj, Czechia - 43.84 miles  Visit Log
Retrieve It from a Cache 9/11/2010 milanoxx retrieved it from Ctyrlistek pro prasatko Středočeský kraj, Czechia   Visit Log

Po eventu s prasátkem v Dobrovici se vracím majiteli zpátky do kapsy a hurá na další event.
Dropped Off 9/11/2010 milanoxx placed it in Ctyrlistek pro prasatko Středočeský kraj, Czechia - 32.8 miles  Visit Log
Discovered It 9/7/2010 biker V. discovered it   Visit Log

Nám se v týmu už toho tolik ztratilo, že se ani nedivím, že takovejhle kousek nedá majitel z ruky.
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