If ‘δ’ is the declination of the star and ‘φ’ is the latitude of the observer then the hour angle of the star at elongation is given by

A. sin H = tan φ . cot δ

B. cos H = tan φ . cot δ

C. tan H = tan φ . cot δ

D. None of these

Answer: Option B

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Related Questions on Surveying

Which of the following statements is incorrect ?

A. Error due to refraction may not be completely eliminated by reciprocal levelling.

B. Tilting levels are commonly used for precision work.

C. The last reading of levelling is always a foresight.

D. All of the above statements are incorrect.