Just a word of caution - there is more to the tide than just the location of the sun and moon. The local coastline and bathymetry play a bit part and can change times by some hours. When I worked for the local meteorological organisation, I found that it was not at all straight forward to provide general tide information. For a specific location it is possible to work out the various biases involved and this is how the published tide tables are done. Susan
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