单项选择题

In order to determine latitude, the navigator must know

A．Greenwich time and local time
B．a good deal of mathematics
C．the angle between Polaris and the horizon
D．his precise location
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单项选择题
In relation to the earth, the sun will move _____________.
A．7,000 miles per hour
B．fifteen degrees in one hour
C．1/48th of the world's circumference
D．twice as far as Polaris
单项选择题
A navigator's chronometer will always show _____________.
A．Greenwich time
B．noon time
C．local time
D．sun time
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