This book explains, by following the mainstream of the history of the computus paschalis, i.e. the science developed from the beginning of the third century on behalf of the determination of the date of Paschal Sunday, which rised around AD 250 in Alexandria (Egypt), how of old the date of Easter depends on the phases of the moon, and provides, on the basis of NASA’s Six Millennium Catalog of Phases of the Moon, the reconstruction of the two strongly different lost Metonic 19-year lunar cyc...

This book explains, by following the mainstream of the history of computus (i.e. Paschal reckoning developed from early third century for determining Julian or Alexandrian calendar dates of Paschal Sunday) which shortly after AD 250 rose in Alexandria (Egypt) to ultimately in AD 1582 (turning point in the history of chronology) flow into a more realistic method for determining Gregorian calendar dates of Easter, how at the time calendar dates of Paschal Sunday depended on phases of the moon ...