Question 1390Navigation General

The correct answer is A) 42°10'. The zenith distance is the complement of the observed altitude, meaning it is 90° minus the observed altitude. In this case, the observed altitude is 47°50', so the zenith distance is 90° - 47°50' = 42°10'. The other answer choices are incorrect because: B) 42°50' is not the correct complement of 47°50'. C) 47°50' is the observed altitude, not the zenith distance. D) 132°10' is not the correct complement of 47°50'.