Hover or tap underlined Spanish terms to see their translation and exam tip.
La Hora de Paso del Sol por el Meridiano inferior se determina:The time of transit of the Sun across the lower meridian is determined approximately by:
Show the answer
Correct answer: c) Adding or subtracting 12 hours to/from the time of transit of the Sun across the upper meridian.
Why it is correct
The Sun’s lower meridian transit (apparent midnight) occurs half a solar day (12 hours) before or after its upper meridian transit (apparent noon, tabulated as meridian passage in the Nautical Almanac).
Why the others are not
- a) The Nautical Almanac tabulates upper meridian passage at Greenwich, not lower transit.
- b) There is no such 1/4 correction for the Sun.
- d) A solar half-day is 12 hours, not 12 hours 78 minutes.
How to work it out in the exam
- Sun’s lower meridian transit: time of upper meridian transit ± 12 hours.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de junio · CY Test 1 · question 8 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de junio · CY Test 2 · question 4 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.