Hover or tap underlined Spanish terms to see their translation and exam tip.
Cuando un astro se encuentra en el meridiano superior del lugar:When a celestial body is on the observer’s upper meridian:
Show the answer
Correct answer: c) Its local hour angle is 0º.
Why it is correct
Local Hour Angle (LHA / HL) is measured westward along the celestial equator from the observer’s upper meridian (0° to 360°). When a body crosses the upper meridian (upper transit), its local hour angle is therefore 0° (and its altitude is maximum).
Why the others are not
- a) On the upper meridian the body reaches its maximum altitude (culmination), not its minimum.
- b) Rising and setting occur when the body crosses the horizon (true altitude 0°).
- d) Options a) and b) are false.
How to work it out in the exam
- Upper meridian transit: local hour angle LHA = 0° and maximum altitude.
Where this question comes from
- Junta de Andalucía · 2016 · 1ª convocatoria · CY Módulo de navegación · question 9 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.