Discussion
Apparent drift due to earth rate at latitude 60 degrees north is approximately
Answer: A
Correct answer: 13.0 degrees per hour
Earth rate apparent drift is
\[ 15\sin\phi = 15 \times \sin 60^\circ = 15 \times 0.866 = 13.0\ \mathrm{deg/h} \]
the 15 being the earth's rotation in degrees per hour. The sine dependence means the drift vanishes at the equator, where the axis and the local vertical are perpendicular, and reaches its full 15 degrees per hour at the poles - which is why high-latitude operation demands more frequent realignment.
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