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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