What is the longitude of the geographical position of a body whose Greenwich hour angle is 210°30'?
Official USCG Answer & Rule Citation
Correct Answer: Option C — 149°30'E
Geographical position longitude equals Greenwich Hour Angle when GHA is less than 180° west; if GHA exceeds 180°, subtract it from 360° to find East longitude: 360° - 210°30' = 149°30'E.
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