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En la Longitud 132º 20' E del día 3 de diciembre de 2022, al ser HcL = 3h 24m 10s, se pide calcular la HcG y la Hz.At longitude 132º 20' E on 3 December 2022, when local civil time (HcL) is 3h 24m 10s, calculate the Greenwich civil time (HcG) and zone time (Hz).
Show the answer
Correct answer: a) HcG = 18h 34m 50s (on 2/12/2022) and Hz = 3h 34m 50s (on 3/12/2022)
Why it is correct
Longitude 132º 20′ E equals 8h 49m 20s east and falls in zone −9 (135º E). Subtracting 8h 49m 20s from 03h 24m 10s on the 3rd gives HcG = 18h 34m 50s on the 2nd, and adding 9 hours gives Hz = 03h 34m 50s on the 3rd.
Why the others are not
- b) Misconverts longitude to time and confuses zone time with local civil time.
- c) Forgets to step back one day at Greenwich when subtracting more than 3h 24m.
- d) Assigns the 2nd instead of the 3rd to the zone time.
How to work it out in the exam
- 132º 20′ / 15 = 8h 49m 20s; in east longitude, HcG = HcL − L.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de diciembre · CY Test 1 · question 17 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2022 · Convocatoria de diciembre · CY Test 2 · question 13 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.