Hover or tap underlined Spanish terms to see their translation and exam tip.
¿Qué línea contiene algún lado del triángulo de posición?Which celestial circle contains one of the sides of the navigational triangle (triángulo de posición)?
Show the answer
Correct answer: c) Vertical circle of the body.
Why it is correct
The three sides of the navigational triangle (PZX) lie on great circles: colatitude (along the observer’s upper meridian, P to Z), polar distance (along the body’s hour circle, P to X) and zenith distance (along the body’s vertical circle, Z to X).
Why the others are not
- a) Colatitude lies on the observer’s upper meridian, not the lower meridian.
- b) A parallel of declination is a small circle and cannot form a side of a spherical triangle.
- d) An almucantar is a small circle of equal altitude, not a great circle.
How to work it out in the exam
- Navigational triangle sides lie on the upper meridian, the body’s hour circle and the body’s vertical circle.
Where this question comes from
- Junta de Andalucía · 2016 · 1ª convocatoria · CY Módulo de navegación · question 3 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.