What is the length of the lunar day?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 24h 50m 00s
The lunar day, or tidal day, is the time required for the Moon to transit the same meridian twice. Due to the Moon's orbital motion in the same direction as Earth's rotation, this period is approximately 24 hours and 50 minutes, as defined in Bowditch.
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