Discussion
Earth rate apparent drift is proportional to the __________ of the latitude.
Answer: B
Correct answer: sine
Earth rate apparent drift is \( 15\sin\phi \) degrees per hour, so it is zero at the equator and 15 at the poles.
Physically, at the equator the local vertical is perpendicular to the earth's axis and the rotation produces no apparent movement in azimuth; at the pole the vertical is parallel to it and the full rate appears. The same sine of latitude governs transport wander, which is why the two combine simply on any given track.
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