Bernáth, Balázs <br/><br/>
Orientation with a Viking sun-compass, a shadow-stick, and two calcite sunstones under various weather conditions.  [electronic resource] 

 -  Applied optics  Sep 2013 
 - 6185-94 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, Non-U.S. Gov't 
<br/><br/><label>ISSN: </label>1539-4522 
<br/><br/><label>Standard No.: </label>10.1364/AO.52.006185  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calcium Carbonate--chemistry<br/>Magnetic Fields<br/>Orientation<br/>Refractometry--instrumentation<br/>Spatio-Temporal Analysis<br/>Sunlight<br/>Weather