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if electricity ever goes out, it would be important for a north hemisphere dweller to keep a chronometer or two handy, as well as a sextant
if you know the exact co-ordinates of your house, you can always set the chronometers if they are off
then you can travel away from the house with one chronometer
and at high noon the difference between 12 o clock and your chronometer gives you the distance you traveled in longitudinal degrees
elementary stuff for people that "already know this" but seriously guys its almost as accurate as modern GPS
