Which statement is true? tides occur about an hour later each day. tides occur at the same time each day. tides occur about an hour earlier each day. tides do not happen at set times.

On the average over the period of a month, the high
and low tides occur 48.8 minutes later per day.


The tides correspond to the angle in the sky between the sun and moon,
     and so do the phases of the moon.
The same moon phase shows up again 29.53 days later ... that's when
     the sky angle between the sun and moon will be the same.
Also during that time, the moon has crawled once around the whole sky ...
     having lost 24 hours to the sun.

                      (24 hours) / (29.53 days)  =  0.813 hour

                                                             =  48.8 minutes.  

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