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El día 23 de noviembre de 2024, al ser HcL= 22h 57m 30s, encontrándonos en una L= 120º 15´W. Se pide calcular la HcG y la Hz.On 23 November 2024 at local civil time (HcL) 22h 57m 30s, at longitude L = 120º 15' W, calculate the Greenwich civil time (HcG) and zone time (Hz).
Show the answer
Correct answer: a) HcG = 06h 58m 30s (on 24/11/2024) and Hz = 22h 58m 30s (on 23/11/2024).
Why it is correct
Longitude 120º 15′ W equals 8h 01m 00s west and lies in zone +8. Adding 8h 01m 00s to 22h 57m 30s on the 23rd gives HcG = 06h 58m 30s on the 24th, and subtracting 8 hours gives Hz = 22h 58m 30s on the 23rd.
Why the others are not
- b) Subtracts 8h 01m as if the longitude were east.
- c) Adds 10 hours instead of 8 hours when converting to Greenwich.
- d) Subtracts longitude in time and miscalculates the zone.
How to work it out in the exam
- 120º 15′ W = 8h 01m W (zone +8): west adds to find HcG.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2024 · Convocatoria de noviembre · CY Test 1 · question 13 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2024 · Convocatoria de noviembre · CY Test 2 · question 12 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.