Hover or tap underlined Spanish terms to see their translation and exam tip.
¿En qué caso particular el ecuador celeste y el horizonte astronómico son perpendiculares?In which case are the celestial equator and the astronomical horizon perpendicular?
Show the answer
Correct answer: d) If the observer is on the equator.
Why it is correct
At the equator the poles lie on the horizon and the celestial equator passes overhead. So the planes are perpendicular.
Why the others are not
- a) It happens.
- b) There they coincide.
- c) They make 45º.
How to work it out in the exam
- Equator: perpendicular. Pole: coincide.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2026 · Convocatoria de abril · CY Test 1 · question 10 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2026 · Convocatoria de abril · CY Test 2 · question 9 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.