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En Faro (37º 02' N, 007º 56' W) es Hora Legal = 23h 23m 23s del 23 de abril de 2020. ¿Cuál es la Hora Civil del Lugar en Carboneras (37º 00' N, 001º 54' W)?In Faro (37º 02' N, 007º 56' W) the zone time (Hora Legal) is 23h 23m 23s on 23 April 2020. What is the local civil time (HcL) in Carboneras (37º 00' N, 001º 54' W)?
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Correct answer: c) 00h 15m 47s on 24 April
Why it is correct
Faro (007º 56′ W) is past 7º 30′ W and lies in zone +1 W, so HcG = 23h 23m 23s + 1h = 00h 23m 23s on 24 April. Subtracting Carboneras's longitude in time (001º 54′ W = 7m 36s) gives HcL = 00h 15m 47s on 24 April.
Why the others are not
- a) Puts Faro in zone 0 instead of zone +1 W (007º 56′ W > 7º 30′ W).
- b) Puts Faro in zone 0 and also adds Carboneras's 7m 36s.
- d) Adds Carboneras's 7m 36s as if it lay east of Greenwich.
How to work it out in the exam
- 007º 56′ W > 7º 30′ W → zone +1 W; 001º 54′ W = 7m 36s W.
Where this question comes from
- Junta de Andalucía · 2020 · Convocatoria de e · CY Módulo de navegación · question 14 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.