Hover or tap underlined Spanish terms to see their translation and exam tip.
La vertical del observador (recta perpendicular al horizonte que pasa por el observador) corta a la esfera celeste en los puntos denominados:The observer’s vertical (the line perpendicular to the horizon passing through the observer) intersects the celestial sphere at the points called:
Show the answer
Correct answer: a) Zenith and nadir.
Why it is correct
Extending the observer’s vertical (plumb line) in both directions intersects the celestial sphere at two diametrically opposite points: the zenith (directly overhead) and the nadir (directly underfoot).
Why the others are not
- b) The elevated and depressed poles are where the celestial axis intersects the celestial sphere.
- c) Aries and Libra are the intersections of the ecliptic with the celestial equator.
- d) North and South are the intersections of the observer’s meridian with the true horizon.
How to work it out in the exam
- Observer’s vertical ∩ celestial sphere = Zenith (overhead) and Nadir (underfoot).
Where this question comes from
- Junta de Andalucía · 2022 · 3ª convocatoria · CY Módulo de navegación · question 10 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.