Hover or tap underlined Spanish terms to see their translation and exam tip.
Los puntos cardinales Este y Oeste se obtienen en la esfera celeste, con el punto de corte del Horizonte conOn the celestial sphere, the East and West cardinal points are obtained at the intersection of the Horizon with:
Show the answer
Correct answer: a) The Celestial Equator.
Why it is correct
The true horizon and the celestial equator are two great circles whose planes intersect along the East–West line (perpendicular to the observer’s meridian). Their two intersection points on the celestial sphere are therefore the East (E) and West (W) cardinal points.
Why the others are not
- b) A body’s vertical circle meets the horizon at the foot of the vertical (giving its azimuth).
- c) The observer’s meridian intersects the horizon at the North and South cardinal points.
- d) A body’s hour circle rotates continuously with diurnal motion.
How to work it out in the exam
- East and West cardinal points: intersection of the True Horizon with the Celestial Equator.
Where this question comes from
- Junta de Andalucía · 2015 · 2ª convocatoria · CY Módulo de navegación · question 9 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.