Hover or tap underlined Spanish terms to see their translation and exam tip.
Simultáneamente le toma altura instrumental a la estrella "Antares" con= 75 09,5' (elevación del observador= 4 metros y corrección del índice= -2') y calcula su altura verdaderaAt the same time a sextant altitude of the star Antares is taken as 75 09.5′ (height of eye 4 metres and index correction −2′), and its true altitude is calculated.
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Correct answer: a) 75º 03.6′
Why it is correct
75º 09.5′ − 2′ = 75º 07.5′. Dip takes off 1.76 × √4 = 3.5′, and refraction at that altitude about 0.3′. That leaves 75º 03.6′, rounded.
Why the others are not
- b) It does not match the working.
- c) It does not match the working.
- d) A star’s corrections subtract, and this is above the reading.
How to work it out in the exam
- Star: index, dip and refraction. No semi-diameter.
Where this question comes from
- Región de Murcia · 2017 · 2ª convocatoria · CY Tipo 1 · question 15 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.