Discussion
Statement I: Earth rate apparent drift is greatest at the equator.
Statement II: It is proportional to the sine of the latitude.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Statement I is incorrect but Statement II is correct
The second statement gives the relation correctly, and it refutes the first. Since the drift is \( 15\sin\phi \), the sine is zero at the equator and one at the poles.
Apparent drift from earth rate therefore vanishes at the equator and is greatest at the poles - the opposite of the assertion. Physically, at the equator the local vertical is perpendicular to the earth's axis, so rotation about that axis produces no apparent movement in azimuth.
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