Sorry I already had a similar type of question but no answers appeared. So I tried to find the Lunitidal Interval myself but the high tides in San Francisco seem to be occurring before the time when the moon is over the meridian. This would result in a negative number when finding the difference. For example the high tides for SFO for June 17 will occur on 17:16 while the time when the moon is over the meridian is 18:10. Am I doing something wrong.
Thanks for the help