Hover or tap underlined Spanish terms to see their translation and exam tip.
El semicírculo máximo que pasa por el punto donde se encuentra el observador se denomina:The great semicircle passing through the poles and the point where the observer is located is called the:
Show the answer
Correct answer: b) Observer’s Upper Meridian.
Why it is correct
The great semicircle bounded by the poles that passes through the observer’s position (or the zenith on the celestial sphere) is called the observer’s upper meridian; the opposite semicircle 180° away is the observer’s lower meridian.
Why the others are not
- a) The observer’s lower meridian is the opposite semicircle passing through the nadir.
- c) The Greenwich upper meridian only coincides with the observer’s if longitude is 0°.
- d) The Greenwich lower meridian is the 180° meridian.
How to work it out in the exam
- Observer’s upper meridian: great semicircle passing through the observer (and zenith).
Where this question comes from
- Región de Murcia · 2026 · 2ª convocatoria · CY Tipo 1 · question 3 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.