Sidereal time is NOT used __________.
Official USCG Answer & Rule Citation
Correct Answer: Option D — in sight reductions of planet observations
Planet sight reductions utilize Greenwich Hour Angle (GHA) increments and planetary ephemerides directly from the Nautical Almanac. Conversely, sidereal time and Local Hour Angle of Aries are fundamental for star finders, star charts, and Pub 249 sight reductions, making sidereal time unnecessary for direct planetary reductions.
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