How do you calculate longitude?
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ANSWER :
Because 1 day is 24 hour long; so we can easily use time to calculate longitude.
EXPLAINATION :
One hour of time difference coresponds to 15 degree of longitude ( 360 degree /24 hour = 15 degree per hour) .
Suppose an observer sets his accurate watch to 12:00 at noon in Greenwich ,England and then travels a great distance.
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