Medieval Chronicles and the Rotation of the Earth
The main purpose of this work is to obtain and assess a large body of observations of solar eclipses from medieval records (roughly the period from 400 to 1200), and to use the observations in improving our knowledge of the motion of the solar system. Catalogues of various types of data are given in the appendices including but not limited to lunar eclipses, comets, novae, famines, and earthquakes.
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BACKGROUND AND PURPOSES OF THE WORK
THE EASTER PROBLEM
ANNALS CHRONICLES AND HISTORIES
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6th hour accelerations according annalist annals appeared assigned assume astronomical Bede believe Byzantine calculations calendar calends called century Chapter chronicle church cited close compiled Conclusions contains contemporaneous continuation copied correct detail discussion early Easter edition editor entry error example fact feria G.H. Pertz give given Hahn's Hannover happened Hence hour identified independent interesting Italy known later lists lunar eclipse magnitude means medieval mentioned monastery month Monumenta Germaniae Historica moon needed nones notes notice observation occurred original perhaps Place possible probably reason record Reference Reliability Roman says Scriptores Section seems seen Sigebertus solar eclipse Standard deviation stars TABLE taken tion translation Ulster writing written wrote