An astrocompass is a navigational tool for determining the direction of true north through the positions of various astronomical bodies. There are certain circumstances when magnetic compasses and gyrocompasses are unreliable. The most obvious is in polar regions, where the force exerted on the needle of a magnetic compass is nearly vertical and g...
Found on
http://en.wikipedia.org/wiki/Astrocompass
Instrument that gives direction based on the positions of the stars and is independent of magnetism.
Found on
http://jot101.com/2015/05/a-z-of-science-fiction-words/
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