time, off topic

[Frank Evans]

During Darwin's famous voyage aboard the "Beagle", Captain Fitzroy had 
22 chronometers aboard, no doubt to obtain accurate longitudes. This 
seems pretty excessive and I'm wondering how many (or few) chronometers 
would have reduced his time errors to an acceptable level. Any thoughts? 
Poisson distribution, perhaps?
Frank 55N 1W
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