The Moon is subject to four types of libration. Which of the following is NOT one of these types of libration?
Official USCG Answer & Rule Citation
Correct Answer: Option C — Horizontal libration
Bowditch identifies the four lunar librations as libration in latitude, libration in longitude, diurnal libration, and physical libration. 'Horizontal libration' is not recognized in navigational astronomy nomenclature.
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