Hover or tap underlined Spanish terms to see their translation and exam tip.
¿En dónde coinciden el Tiempo Universal, la Hora Civil del Lugar y la Hora Legal?Where do Universal Time, Local Mean Time and Zone Time all coincide?
Show the answer
Correct answer: c) At all places whose longitude is 0º.
Why it is correct
Local Mean Time (LMT) equals Zone Time (ZT) on every 15° central meridian, and Zone Time equals Universal Time (UT) throughout Zone 0. For all three to coincide simultaneously (UT = LMT = ZT), the observer must lie on the Greenwich meridian itself (longitude 0°).
Why the others are not
- a) All three do coincide along the 0° longitude meridian.
- b) At ±15°, ±30°, etc., LMT and ZT match each other, but differ from UT by the zone number.
- d) Within Zone 0 away from longitude 0°, Local Mean Time differs from UT by up to ±30 minutes.
How to work it out in the exam
- UT = Local Mean Time = Zone Time: only at places with longitude 0°.
Where this question comes from
- Junta de Andalucía · 2016 · 2ª convocatoria · CY Módulo de navegación · question 2 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.