Hover or tap underlined Spanish terms to see their translation and exam tip.
Ángulo sidéreo de un astro, es el arco de Ecuador celeste de…The Sidereal Hour Angle (SHA) of a celestial body is the arc of the celestial equator of…
Show the answer
Correct answer: a) 0º to 360º, measured from the First Point of Aries to the body’s hour circle from East to West.
Why it is correct
Sidereal Hour Angle (SHA / AS) is measured along the celestial equator from the First Point of Aries (♈) to the body’s hour circle, from 0° to 360° westward (from East to West).
Why the others are not
- b) Measured eastward (West to East) from Aries is Right Ascension (RA = 360° − SHA).
- c) Sidereal Hour Angle runs from 0° to 360°, not 0° to 180°.
- d) Neither the direction (eastward) nor the range (0°–180°) matches Sidereal Hour Angle.
How to work it out in the exam
- Sidereal Hour Angle (SHA): 0° to 360° from Aries to the body’s hour circle in the E → W direction.
Where this question comes from
- Región de Murcia · 2026 · 1ª convocatoria · CY Tipo 1 · question 6 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.