Tide clock formalue

[jackho]

Anyone out there have any ideas to make a tide clock? I'm particularly interested if a formalue exists to programme my laptop to replicate a conventional tide clock - i.e. one revolution (360 deg) = approx 85 mins. Maybe with programmable alerts.
Any mods. to a conventional clocks also considered e.g. like non linear clock face - maybe oval, calibrated to reflect tidal harmonics? Or even running battery clock at higher voltage to speed up!!!
Thought that given the weather is going to make most of us dry land sailors over the weekend it might give some dry land sailors someing to think about!!!!!!!!!!!
Any ideas welcome

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[LadyInBed]

Have you googled "Tidal clock" there is loads of products and info.

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[Ovni]

Those clocks use a simplification in semi diurnal tides. After they are set to a correct spring high they use the moon as a standard tide maker. This means that the complete tidal movement from high to low to high is always exactly the same. And that is wrong. There are some differences but after 18 years the whole cyclus is round.
But for a gadget on the office wall this will work, with a max miss calculation of aprox. 30 minutes;

moon round earth in
360/28.984104 = 12 hours 26 minutes 20.7 seconds

Most modern batery driven clocks can still be corrected for that. Just slow it down a little. Take away the minutes. With some testing you have a tidal clock.

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[jackho]

Will try Google - Had scanned the forum but not much on it.

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[AvanLoon]

http://www.venker.net/
On this site you find the information of a profesional tideclock builder.
Click on this page at "Waar geijteklokken?" and there you'll see the formula on which these clocks are built. Maybe easier than you thought?

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[BrendanS]

Make an electronic one
http://www.flaterco.com/xtide/credits.html
It is based on the original work shown here , which shows the calculations http://www.epemag.com/projcat.html



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