An important lunar cycle affecting the tidal cycle is called the nodal period. How long is this cycle?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 19 years
In USCG General Navigation principles (Bowditch, Light Lists, and Coast Pilots), regarding 'An important lunar cycle affecting the tidal cycle is called the nodal period. How long is this cycle', the verified fact is: '19 years'.
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