Historical Values of the Earth's Clock Error Δ and the Calculation of Eclipses

  title={Historical Values of the Earth's Clock Error $\Delta$ and the Calculation of Eclipses},
  author={Leslie V. Morrison and Francis Richard Stephenson},
  journal={Journal for the History of Astronomy},
  pages={327 - 336}
Numerous observations of the Moon, Sun and planets are recorded in ancient and medieval history. These observations which include many eclipses and lunar and planetary conjunctions frequently attract the interest of historians of astronomy. If the positions of the Moon and Sun (and to a lesser extent the planets) in the historical past are to be computed with high precision, it is usually necessary to make satisfactory allowance for the effect of variations in the Earth's rate of rotation, or… 

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