Hover or tap underlined Spanish terms to see their translation and exam tip.
El arco de ecuador, contado de 0º a 180º desde el meridiano superior del lugar, hacia el este o el oeste, hasta el círculo horario de un astro, es:An equatorial arc counted 0º to 180º East or West from the observer’s upper meridian to a body’s hour circle is:
Show the answer
Correct answer: c) The Meridian Angle (Polar Angle P).
Why it is correct
The meridian angle or polar angle (P) is the arc of the celestial equator measured from the observer’s upper meridian to the body’s hour circle, from 0° to 180° West (after transit) or East (before transit).
Why the others are not
- a) Local Hour Angle (LHA / HL) is always measured westward from 0° to 360°.
- b) Sidereal Hour Angle is measured westward from the First Point of Aries from 0° to 360°.
- d) Longitude is measured from the Greenwich meridian to the observer’s meridian.
How to work it out in the exam
- Polar Angle (P): equatorial arc 0° to 180° E or W from the observer’s upper meridian to the body.
Where this question comes from
- Junta de Andalucía · 2016 · 1ª convocatoria · CY Módulo de navegación · question 8 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.