Hover or tap underlined Spanish terms to see their translation and exam tip.
Para un observador en latitud N, cuando el acimut de un astro es 0º:For an observer in North latitude, when the azimuth of a celestial body is 0º:
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Correct answer: d) Answers b) and c) are correct.
Why it is correct
For an observer in North latitude, a body bearing 000° lies due North on the observer’s meridian (either at upper transit with LHA = 0° when δ > φ, or at lower transit with LHA = 180°). In both cases its vertical semicircle and hour semicircle lie on the great circle of the observer’s meridian.
Why the others are not
- a) Azimuth 0° means bearing due North, not that altitude is 0° on the horizon.
- b) True, but option c) is also true.
- c) True, but option b) is also true.
How to work it out in the exam
- Azimuth 0° in N latitude: meridian transit (LHA = 0° or 180°); vertical and hour circles lie on the same great circle.
Where this question comes from
- Junta de Andalucía · 2016 · 3ª convocatoria · CY Módulo de navegación · question 2 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.