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A hora civil de Greenwich 1330, continúan navegando en las mismas condiciones y su situación estimada es 23º 27' S - 041º 30'W y obtiene horario en Greenwich del Sol = 020º 45,7'. Calcula el ángulo en el Polo (P)At Greenwich civil time 1330, still sailing in the same conditions, the DR position is 23º 27′S 041º 30′W and the Sun’s Greenwich hour angle is 020º 45.7′. Calculate the meridian angle (P).
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Correct answer: c) 20º 44.3′E
Why it is correct
Local hour angle = 20º 45.7′ − 41º 30′ = −20º 44.3′. Negative: the Sun has not reached the meridian, so P is east.
Why the others are not
- a) It does not match the working.
- b) It does not match the working.
- d) The value is right, but the Sun is east.
How to work it out in the exam
- West longitude: subtract from the Greenwich hour angle.
- Sun before the meridian: P east.
Where this question comes from
- Región de Murcia · 2019 · 1ª convocatoria · CY Tipo 1 · question 15 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.