Concise Curriculum Vitae
Jan Zuidhoek was born in 1938, studied mathematics, physics, and astronomy at the university of Utrecht from 1960 to 1969, and was a teacher of mathematics from 1970 to 2001 at the Gymnasium Celeanum in Zwolle. After having steeped himself in the fields of history of mathematics, chronology, and history of early Christianity, he became fascinated by the Alexandrian computus, i.e. the Alexandrian form of the computus paschalis being the science developed from the beginning of the third century on behalf of the determination of the date of Paschal Sunday. It is on the basis of NASA’s Six Millennium Catalog of Phases of the Moon and by reconstructing the proto‑Alexandrian 19‑year lunar cycle being the Metonic 19‑year lunar cycle the great third century Alexandrian computist Anatolius started from in order to construct his legendary 19-year Paschal cycle, that he succeeded in determining the initial year (AD 271) of De ratione paschali being the only surviving medieval (Latin) text containing Anatolius’ 19‑year Paschal cycle. The reconstruction in question was the subject of the presentation he gave at the international conference on the science of computus which took place at the university of Galway in 2010. It was published in 2017 as an article in the proceedings of that conference entitled “The initial year of De ratione paschali and the relevance of its paschal dates”. The presentation he gave at the international conference on the science of computus at the university of Galway in 2019, entitled “Reconstructing the Alexandrian 19-year lunar cycles”, resulted in the present study, which provides the reconstruction of both lost Metonic 19-year lunar cycles actively constructed before the first council of Nicaea (AD 325), turning point in the history of Christianity.
© Jan Zuidhoek 2019-2020