Hover or tap underlined Spanish terms to see their translation and exam tip.
Determine la altura verdadera (av) del Sol limbo inferior. Fecha de observación: 23 de abril de 2023, altura instrumental sol limbo inferior= 40º 00’; Ci= - 3' y elevación observador = 1,8 m.Determine the true altitude (av) of the Sun's lower limb on 23 April 2023, given sextant altitude = 40º 00’, Ci = -3', and height of eye = 1.8 m.
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Correct answer: a) 40º 9.5'.
Why it is correct
With ai = 40º 00.0′ and Ci = −3.0′ we get ao = 39º 57.0′. Subtracting dip for 1.8 m (−2.4′) gives aap = 39º 54.6′, and adding the April lower-limb Sun correction (+14.9′) yields av = 40º 09.5′.
Why the others are not
- b) Subtracts nearly 4 degrees by a transcription error.
- c) Subtracts the Sun correction (−15.0′) instead of adding it for the lower limb.
- d) Forgets to add the Sun's semi-diameter.
How to work it out in the exam
- av = 40º 00′ − 3.0′ (Ci) − 2.4′ (dip) + 14.9′ (Sun) = 40º 09.5′.
Where this question comes from
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de abril · CY Test 1 · question 12 Official paper · Official answer key
- Ministerio de Transportes (Madrid) · 2023 · Convocatoria de abril · CY Test 2 · question 19 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.