Walter & Group.....
I just finished studying BEYOND THE MOON by James Creig McCully, 2006 , ISBN : 981 256 643 0 (Paperback = ISBN : 981 256 644 9 ).
This is the very best thing I've ever read on Ocean tides.
The author has gone way beyond my simplified description of the reason for semidiurnal tides (such as we experience here in the florida Keys .... and most other Atlantic coastline areas of North America).
I stated what is only a partial truth when I said that the kind of semidurnal tide effect in the lower Florida Keys was due to the tidal time differences of two different oceans in close proximity.
McCully goes in to very easily understood detail on the effects of the gravitational pull of the moon with its orbital changes, differing distances from the Earth as it goes from apogee to perigee, as well as its changing angle of declination . Also, the effects exerted by the sun as well as the, "wobble effect" as the Earth tries to rotate in turn about the moon (with the center of its orbit within the substance of the planet !)
His description of the multiple tidal wave forms which effect one another to result in the final resultant wave form at any one location is masterfully done.
The greatest "plus" I found in this book is his skill in transforming celestial and earthbound physics and complicated mathematical formulae into very understandable language presented in a way that I found a pleasure to read.
My thanks to Peter Lami and Dave Lambert for introducing me to it.
Gordy