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Whitehurst & Son sundial

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Orbital Dynamics Part 17 Sidereal Day and Equation of Time

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The Whitehurst & Son sundial was produced in Derby in 1812 by the nephew of John Whitehurst. It is now in the Derby Museum and Art Gallery. It is a fine example of a precision sundial telling local apparent time with a scale to convert this to local mean time. It is accurate to the nearest minute.
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