Input the longitude and the watch calibrates when the moon is over the longitude (moon up). Input the difference from moon up until the next high tide. This is the lunitidal interval. This is used to calculate the time of tides.
Lunar Tidal
Input the longitude and the watch calibrates when the moon is over the longitude (moon up). Input the difference from moon up until the next high tide. This is the lunitidal interval. This is used to calculate the time of tides.
Lunar Tidal
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