2014 April meeting

Of Clockwork and Shadows 

by Andrew James

The Equation of Time, the difference between “clock time” or mean time and “sundial time”, may nowadays seem of little relevance, but it was formerly of great significance.

What is it? Why does it exist? How does it change over time? Who measured it? How have clock and watchmakers reconciled the two time systems?

These are a few of the topics Andrew James will discuss. Many ingenious mechanisms have been devised to show the Equation of Time on a clock, or to show solar time, and Andrew will explain a number of these and demonstrate some with computer animations.

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