Hover or tap underlined Spanish terms to see their translation and exam tip.
¿Qué líneas de la esfera celeste son coincidentes?:Which lines on the celestial sphere coincide with each other?
Show the answer
Correct answer: d) The hour semicircle and the circle of right ascension (“máximo de ascensión”) of the body.
Why it is correct
In nautical astronomy, the great semicircle running from pole to pole through a celestial body is called both its hour semicircle (circle of declination) and its circle of right ascension (máximo de ascensión); the two lines are therefore identical.
Why the others are not
- a) The almucantar and the body’s vertical semicircle are perpendicular to each other.
- b) An almucantar is parallel to the horizon whereas a parallel of declination is parallel to the equator.
- c) They only coincide at the instant the body transits the observer’s meridian.
How to work it out in the exam
- Hour semicircle and 'máximo de ascensión': two names for the same pole-to-pole semicircle through the body.
Where this question comes from
- Junta de Andalucía · 2026 · 1ª convocatoria · CY Módulo de navegación · question 5 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.