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.

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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 9/6/2010 prasklaHruska discovered it   Visit Log

Škoda, že tam nebyl. Ale on by tam stejne dlouho nevydržel...

Discovered It 9/6/2010 gabo666 discovered it   Visit Log

Krasny kus.
Retrieve It from a Cache 9/6/2010 milanoxx retrieved it from Pojdme si zazpivat III aneb GeoPotlach s Devitkou Hlavní město Praha, Czechia   Visit Log

Po koncertu v Praze mrkneme zas o dum dál ..
Dropped Off 9/6/2010 milanoxx placed it in Pojdme si zazpivat III aneb GeoPotlach s Devitkou Hlavní město Praha, Czechia - 39.6 miles  Visit Log
Discovered It 8/25/2010 Vrabčanda discovered it   Visit Log

Zajímavý coin. Díky. Jarda a Lída
Discovered It 8/16/2010 washar discovered it   Visit Log

Dle obrázku krásná mince. Kod objeven v mikro u jeskyne Krtola. Díky.
Discovered It 8/11/2010 Anjama discovered it   Visit Log

To je nahoda, tebe jsem sice nespatrila (jen jsem si dosla na Krtolu pro kod), ale jako bych te videla, nebot mam doma zrovinka stejnej. Diky.
Discovered It 6/27/2010 Mandorun discovered it   Visit Log

Díky!
Discovered It 6/26/2010 Dutch Team discovered it   Visit Log

videno na našem eventu v Dobšicích, nádherný coin, který se musí líbit každému...díky ownerovi za to, že ho donesl.

Retrieve It from a Cache 6/26/2010 milanoxx retrieved it from EVENT MALEHO DOBSE Středočeský kraj, Czechia   Visit Log

Po hezkém eventu nedaleko od Podebrad se mrkneme nekam dál ..
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