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Si nos encontramos en una Longitud 110º 45' W del día 25 de octubre de 2023, al ser HcL = 23h 44m 50s, se pide calcular la HcG y la Hz.At longitude 110º 45' W on 25 October 2023, when local civil time (HcL) is 23h 44m 50s, calculate the Greenwich civil time (HcG) and zone time (Hz).
Show the answer
Correct answer: a) HcG = 07h 07m 50s (on 26/10/2023) and Hz = 0h 7m 50s (on 26/10/2023).
Why it is correct
Longitude 110º 45′ W equals 7h 23m 00s west and lies in zone +7. Adding 7h 23m 00s to 23h 44m 50s on the 25th gives HcG = 07h 07m 50s on 26/10/2023, and subtracting 7 hours gives Hz = 00h 07m 50s on 26/10/2023.
Why the others are not
- b) Fails to advance the date to the 26th after crossing midnight.
- c) Subtracts 7h 23m as if the longitude were east.
- d) Adds only 7 exact hours for HcG and inverts the zone offset.
How to work it out in the exam
- 110º 45′ / 15 = 7h 23m (zone +7 W).
Where this question comes from
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de noviembre · CY Test 1 · question 20 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de noviembre · CY Test 2 · question 19 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.