Hover or tap underlined Spanish terms to see their translation and exam tip.
En el cálculo de la situación observada suelen utilizarse dos de los ángulos del triángulo de posición. Estos ángulos son:When calculating an observed position (sight reduction), two angles of the navigational triangle are normally used. Which are they?
Show the answer
Correct answer: b) The angle at the pole (meridian angle) and the angle at the zenith (azimuth angle).
Why it is correct
When solving the navigational triangle (PZX) in sight reduction, we enter with the meridian/polar angle (P, at the elevated pole) and compute the azimuth angle at the zenith (Z). The third angle, at the celestial body (the parallactic angle X), is seldom used.
Why the others are not
- a) 'Azimuthal angle' and 'angle at the zenith' refer to the same vertex (Z), omitting the polar angle (P).
- c) The parallactic angle (at the body) is not needed to plot a line of position.
- d) Omits the polar angle (P), which is an essential input.
How to work it out in the exam
- Angles of the navigational triangle used in sight reduction: polar angle (P) and zenith angle (Z).
Where this question comes from
- Junta de Andalucía · 2022 · 3ª convocatoria · CY Módulo de navegación · question 6 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.