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Discussion on Tide Tables

The UK Hydrographic Office has copyright over the harmonic constant tables
used to calculate accurate Tide times and tide heights around the U.K. A
licence has to be purchased to use these tables.

An alternative less accurate method uses the interaction of planetary
bodies, namely the Moon and Sun.

The phase of the moon can easily be calculated and by knowing the actual
time of day of the moons phases throughout the year

plus past high tides, then an estimate can be made of tides in the future.
However, the necessary calculations are taking too long.

Hence , as a start, the program normally used to calculate tides using harmonic
constants was amended to delete all the UKHO harmonic constants

and then add a single normalised constant. This was adjusted by trial and
error to give symmetrical errors throuhout the year. 90% of the tides

so calculated lie within one hour and 99% within one hour and a half of the
actual historic tides.

If you have any comments or suggestions on the tide tables then please
EMail me

Updated 30Dec02