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Día 19 de noviembre de 2021, a hora civil de Greenwich (HCG) 1020, en situación estimada 26º 40,2´N – 021º 27,2´W, tras haber obtenido la declinación del Sol para ese instante -19º 33,4 y el valor del ángulo en el polo 42º 41,0’ (E), calculan la altura estimada del Sol utilizando las fórmulas que definen los lados del triángulo de posición:19 November 2021, at Greenwich civil time 1020, at DR position 26º 40.2´N – 021º 27.2´W, having obtained the Sun’s declination -19º 33.4 and angle at the pole 42º 41.0’ (E), they work out the Sun’s computed altitude with the formulas for the sides of the position triangle:

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Correct answer: b) 27º 57.1´

Why it is correct

With d negative, the formula gives 27º 57.1′.

Why the others are not

  • a) It does not match the working.
  • c) It does not match the working.
  • d) It does not match the working.

How to work it out in the exam

  1. sin a = sin l sin d + cos l cos d cos P.

Where this question comes from

Try it: Sight reduction

Pending instructor review. Machine translation, not reviewed.