Spanish original · English

Hover or tap underlined Spanish terms to see their translation and exam tip.

Sobre la esfera celeste un yate se encuentra en un meridiano celeste concreto y en ese instante, un astro se encuentra en su círculo horario correspondiente. ¿Cómo se llama el arco de Ecuador celeste entre el meridiano celeste del observador y el círculo horario del astro?On the celestial sphere a yacht is on a given celestial meridian and, at that instant, a body is on its hour circle. What is the arc of the celestial equator between the observer’s celestial meridian and the body’s hour circle called?

Show the answer

Correct answer: b) Local hour angle.

Why it is correct

It runs from the observer’s meridian to the body: the local hour angle.

Why the others are not

  • a) A Greenwich hour angle starts at Greenwich.
  • c) It starts at Greenwich, not at the observer.
  • d) The sidereal angle starts at Aries.

How to work it out in the exam

  1. From the observer: local. From Greenwich: Greenwich. From Aries: sidereal.

Where this question comes from

Try it: Sight reduction

Pending instructor review. Machine translation, not reviewed.