Hover or tap underlined Spanish terms to see their translation and exam tip.
Indique la opción correcta en relación con las coordenadas uranográficas ecuatoriales de un astro:Identify the correct option concerning the equatorial uranographic coordinates of a celestial body:
Show the answer
Correct answer: b) Sidereal hour angle is equal to 360º minus right ascension.
Why it is correct
Both Sidereal Hour Angle (SHA / AS) and Right Ascension (RA / AR) are measured along the celestial equator from the First Point of Aries (♈) to the body’s hour circle, but in opposite directions (SHA westward, RA eastward). Their sum is 360°, so SHA = 360° − RA.
Why the others are not
- a) Both coordinates are measured from the First Point of Aries, not from Libra.
- c) A body’s declination is identical in both hour-angle and uranographic equatorial coordinates.
- d) Options a) and c) are false.
How to work it out in the exam
- Relation between Sidereal Hour Angle and Right Ascension: SHA = 360° − RA.
Where this question comes from
- Junta de Andalucía · 2025 · 2ª convocatoria · CY Módulo de navegación · question 6 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.