Hover or tap underlined Spanish terms to see their translation and exam tip.
El “arco nocturno” se define como:In celestial navigation, the “nocturnal arc” (“arco nocturno”) is defined as the:
Show the answer
Correct answer: d) Apparent arc traced below the horizon by the Sun or another celestial body.
Why it is correct
A body’s parallel of declination is divided by the horizon into two segments during its apparent daily revolution: the diurnal arc (traced above the horizon from rising to setting) and the nocturnal arc (traced below the horizon from setting to rising).
Why the others are not
- a) A luminous ring of 22° or 46° radius around the Sun is an atmospheric solar halo.
- b) The apparent arc traced above the horizon is the diurnal arc.
- c) A luminous ring around the Moon is a lunar halo.
How to work it out in the exam
- Nocturnal arc: apparent arc traced below the horizon by the Sun or another celestial body.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2021 · Convocatoria de julio · CY Test 2 · question 1 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2021 · Convocatoria de julio · CY Test 3 · question 3 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.