Question

If a place is affected by tide at $6:00AM$ Monday, normally at what time the same place will be affected by Ebb?

• A. $6:26PM$ Monday
• B. $6:52PM$ Tuesday
• C. $12:13PM$ Monday
• D. $00:26AM$ Tuesday

Answer 1

Answer: (A)

$6:26PM$ Monday

Due to the Moon's orbital prograde motion, it takes a particular point on the Earth (on average) $24$ hours and $50.5$ minutes to rotate under the Moon, so the time between high lunar tides fluctuates between $12$ and $13$ hours, generally being $12$ hours and $26$ minutes.

So, if the tide has affected the place at $6:00AM$, then it would generally take around $12$ hours and $26$ minutes for the place to be affected by Ebb i.e $6:00AM+12hrs+26mins=6:26PM$.

Hence, the same place will be affected by Ebb at around $6:26PM$ Monday.