Hover or tap underlined Spanish terms to see their translation and exam tip.
Día 20 de Abril de 2021. Habiendo navegado un 25% de la travesía atlántica desde Bahamas a San Vicente, a hora civil de Greenwich (HcG)= 23:26, se encuentran en situación estimada= 31º 12,0´N – 066º 14,4´W y en ese instante el Capitán, tras haber obtenido del Almanaque Náutico el valor del horario en Greenwich de Aries (HGY)=200º 45,4´, calcula el horario del lugar de Aries (HlY) para ese instante:On 20 April 2021 at Greenwich civil time (HcG) = 23:26, in DR position 31º 12.0' N, 066º 14.4' W, given the Greenwich hour angle of Aries (HGY) = 200º 45.4', calculate the local hour angle of Aries (HlY):
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Correct answer: d) HlY = 134º 31.0'
Why it is correct
In west longitude, the local hour angle is found by subtracting the longitude from the Greenwich hour angle: HlY = 200º 45.4′ − 66º 14.4′ = 134º 31.0′.
Why the others are not
- a) Adds the longitude with an arithmetic error as if it were east longitude.
- b) Fails to subtract the full longitude from the Greenwich hour angle.
- c) Subtracts the degrees between 200º and 66º incorrectly.
How to work it out in the exam
- For any body or Aries: LHA = GHA − L(W).
Where this question comes from
- Región de Murcia · 2021 · 1ª convocatoria · CY Tipo 1 · question 18 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.