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The Equation of Time for a Sundial

The equation of time gives the deviation of the apparent "time" determined by the position of the sun on a sundial, to the "mean time" based on uniform motion of the sun.

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"The Equation of Time for a Sundial" from the Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/TheEquationOfTimeForASundial/
Contributed by: Stephen Wolfram
Based on a program by: Michael Trott
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