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The solar eclipse observed by Clavius in A.D. 1567

The careful description of the solar eclipse of A.D. 1567 by Clavius is used to derive limits to the Earth's rotational clock error (�T) of between 145 and 165 sec at this date. This result provides an important link between theT curve as de- duced from ancient and medieval eclipse observations and that obtained from telescopic data.