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A las 14 38 23 UT del 18 de enero de 2023 se observa el limbo inferior del Sol con altura instrumental = 31º 29,8'. Corrección de índice = +8', elevación del observador = 6 m. Calcular la altura verdadera.At 14 38 23 UT on 18 January 2023 the Sun’s lower limb is observed with a sextant altitude of 31º 29.8'. Index correction = +8', height of eye = 6 m. Calculate the true altitude.
Show the answer
Correct answer: d) 31º 48.2'
Why it is correct
31º 29.8′ + 8′ − 4.3′ dip − 1.6′ refraction + 16.3′ semi-diameter = 31º 48.2′.
Why the others are not
- a) It does not match the working.
- b) It does not match the working.
- c) It does not match the working.
How to work it out in the exam
- Index correction, dip, refraction and semi-diameter.
- Dip = 1.76 × √height.
Where this question comes from
- Junta de Andalucía · 2023 · 2ª convocatoria · CY Módulo de navegación · question 16 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.