Edited by board administrator December 30, 2015, 2:39 pm
Hi Randy, your post is in quotes.
"But if the moon is a major factor you would expect the times to be about 50
minutes later each day, as the moon rises 50 minutes later each day."
Since there are two tide cycles the difference is about 25 minutes each cycle.
"These tides are going backwards, earlier each day".
The moon goes around the earth one time per month, which means it moves a
little (12 degrees) every 24 hours. I made a drawing below to help
explain it to you (an myself).
X is us in La Manzanilla looking up at the moon #1. 24 hours later we are back
where we started but the moon is now in position #2 since it has gone one day
in its 30 day journey around the earth.
The tides are a little different than they were last time we were at #1.
Since the tides change according to the moon it is 50 minutes earlier
in moon time (so to speak).
"By the way, I've been on the gulf coast of Mexico, and not only is there one
tide per day, it's at the same time every day. How can that happen?"
Here is the tide chard for Guymas, the times do change. There is only one
high and one low tide for each day because the surrounding land mass makes the
transfer of the open ocean tides more difficult.