Hover or tap underlined Spanish terms to see their translation and exam tip.
El valor de la “Ascensión Recta” (AR) es equivalente a:In angular units, the value of “Right Ascension” (RA / AR) is equivalent to:
Show the answer
Correct answer: c) 360º − Sidereal Hour Angle.
Why it is correct
Right Ascension (RA / AR, measured eastward from Aries) and Sidereal Hour Angle (SHA / AS, measured westward from Aries) together complete the 360° circle of the celestial equator: RA + SHA = 360°, so RA = 360° − SHA.
Why the others are not
- a) The sum of the two equatorial arcs is 360°, not 180°.
- b) Declination is perpendicular to the equator and has no such relation with Right Ascension.
- d) Declination is measured along the hour circle, not along the equator.
How to work it out in the exam
- Right Ascension in degrees: RA = 360° − Sidereal Hour Angle (SHA).
Where this question comes from
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de junio · CY Test 1 · question 7 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de junio · CY Test 2 · question 7 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.