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I've been trying to find a reference on how to calculate my own tide tables, since I am the lazy sort who finds it easier to do library searches and write computer programs (preferably for my Newton) than to just look in the paper. I finally found a reference, and I'm not happy with the answer. In simple approximation, given a spherical earth and moon, no land masses, earth covered in deep (~20km) water, the tidal bulge is right under and right opposite the moon. The effects of the sun don't complicate things much, but the addition of shallow water and land masses send you off to a series of 20 or 30 cosine terms whose amplitudes and phase angles must be found by observation over years. I'd be happy to do that if anybody reading this is writing grants, and I promise you, I'd be right out there in the water where I could make the most accurate measurement possible. Anyway, this still may be easier than looking in the paper. I can't believe the people selling tide tables commercially would spend years measuring coefficients. This sounds to me like something NOAA or someone would do, in which case it might be possible to track down the equations and coefficients. Anybody out there have any ideas? Seen anything like this? Roger. #----------------------------------------------------# Roger Carlson H 310-376-4437 Somewhere off Hermosa Beach, CA W 310-812-0430 Roger_Carlson@at*.sp*.tr*.co* F 310-812-1363 #----------------------------------------------------#
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