E185 -- Praefatio Euleri ad opus Examen temporum mediorum secundum principia astronomica et Chronologica institutum ab Henrico Guilielmo Clemm. Berolini 1752

(Euler's preface to the work An examination of the Middle Ages, set forth according to astronomical and chronological principles, by Heinrich Wilhelm Clemm, Berlin 1752)


Euler considers the change of the length of months and years since ancient times.

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