单选题Right ascension is primarily used by the navigator for（）.Acalculating amplitudesBcalculating great circle sailings by the Agiton methodCentering the Air Navigation Tables (Selected Stars) Pub 249Dplotting on star finders
单选题
Right ascension is primarily used by the navigator for（）.
A
calculating amplitudes
B
calculating great circle sailings by the Agiton method
C
entering the Air Navigation Tables (Selected Stars) Pub 249
D
plotting on star finders
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