e/Rule of twelfths

Information
has gloss	eng: The Rule of Twelfths is a rule of thumb for estimating the height of the tide at any time, given only the time and height of high and low water. This is important when navigating a boat or a ship in shallow water and when launching and retrieving boats on slipways on a tidal shore.
lexicalization	eng: Rule of twelfths
instance of	(noun) the periodic rise and fall of the sea level under the gravitational pull of the moon tide

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