Hover or tap underlined Spanish terms to see their translation and exam tip.
La intersección entre el vertical primario y el horizonte astronómico o racional contiene:The intersection between the prime vertical and the astronomical (rational) horizon contains:
Show the answer
Correct answer: c) The East and West cardinal points.
Why it is correct
The prime vertical is the vertical great circle perpendicular to the observer’s meridian (passing through the Zenith, Nadir, East and West). Its intersection with the astronomical (true) horizon therefore consists of the East (E) and West (W) cardinal points.
Why the others are not
- a) The North and South cardinal points are the intersection of the observer’s meridian with the horizon.
- b) The zenith and nadir lie on the prime vertical, but 90° away from the horizon.
- d) The polar axis lies in the plane of the observer’s meridian, perpendicular to the prime vertical.
How to work it out in the exam
- Prime vertical ∩ astronomical horizon = East and West cardinal points.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de junio · CY Test 1 · question 9 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de junio · CY Test 2 · question 9 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.