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--- Peter Fogg  wrote:

> Nah. If the tide changes the height of the sea close to the shore
> then presumably it changes the height of the sea at the horizon to
> the same extent.

Yeah, that was my original thought too - since the visible horizon is
only a few miles "out there" the state of the tide should be pretty
much the same there as at the shoreline...

> The dip correction remains the same.

...but the flaw in that argument would be what I said earlier, that the
measured shoreline elevation would depend on the level of the tide at
the time. And if it were in some location that had a much higher daily
variation (say 10' or more), that would definitely be enough to affect
the He correction (seems like it works out to about a minute for every
3 feet or so of He at these "low" levels - don't have an almanac handy
right now).

--
GregR




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