Hover or tap underlined Spanish terms to see their translation and exam tip.
El ángulo diedro (de 0º a 180º) formado por el semicírculo horario del astro y el meridiano superior del lugar es:The dihedral angle (from 0º to 180º) formed by the body’s hour semicircle and the observer’s upper meridian is:
Show the answer
Correct answer: c) The meridian angle (polar angle P).
Why it is correct
The dihedral angle between the plane of the observer’s upper meridian and the plane of the body’s hour semicircle—measured from 0° to 180° East or West at the elevated pole—is the meridian or polar angle (P).
Why the others are not
- a) Right ascension is measured eastward from the First Point of Aries from 0° to 360°.
- b) Sidereal hour angle is measured westward from the First Point of Aries from 0° to 360°.
- d) Longitude is the dihedral angle between the Greenwich meridian and the observer’s meridian.
How to work it out in the exam
- Dihedral angle (0° to 180°) between the observer’s upper meridian and the body’s hour circle = Polar Angle (P).
Where this question comes from
- Junta de Andalucía · 2026 · 1ª convocatoria · CY Módulo de navegación · question 10 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.