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- Q203 - Navigation General: Near Coastal
115. An important lunar cycle affecting the tidal cycle is called the nodal period. How long is this cycle?
The lunar nodal period, approximately 18.6 years and often rounded to 19 years, governs long-term tidal variations. This cycle represents the time it takes for the Moon's orbital plane to complete a full precession relative to Earth's equator, influencing tidal range and timing, and is therefore the correct answer.
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