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Rule Of Thumb
 Tid Bits         Quotes         Six Degrees        Suggested: Arnold Schwarzenegger
The rule of twelfths is an approximation to a sine curve. It can be used as 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. The rule is also useful for estimating the monthly change in sunrise/set and day length.
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Rules of Thumb

Rules of Thumb: A Life Manual

Pilot's rules of thumb: Rules of thumb, easy aviation math, handy formulas, quick tips
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