Question 1487Navigation General

The correct answer is D) plotting on star finders. Right ascension is a celestial coordinate that measures the east-west position of a celestial object on the celestial sphere. It is primarily used by the navigator for plotting on star finders, which are devices used to identify stars and determine their positions in the sky. This allows the navigator to identify their location based on the positions of the observed stars. The other answer choices are incorrect because they do not directly relate to the primary use of right ascension. Right ascension is not directly used for calculating great circle sailings, entering air navigation tables, or calculating amplitudes, which are other navigational tasks performed by the mariner.