Capt. Scumbalino wrote:

Walt wrote:

Capt. Scumbalino wrote:

It's based on the pretty-much universal fact that the time for the
tide to change from high to low water, and vice-versa, is pretty
close to six hours.

Universal, if your universe consists of only places with semi-diurnal
tides. That's the majority, granted, but not everywhere has
semi-diurnal tides.

You might want to get out more.

You might want to try and comprehend the qualifier "pretty-much".

"Pretty much universal" is still an overstatement, even with the qualifier.

http://www.physicalgeography.net/fun...e_type_map.jpg

//Walt