Abbo's Praefatio (post-988) on the paschal cycles argues explicitly against the calculations of Dionysius Exiguus
, whose work had been accepted as authoritative from the first attempts to codify Christian calendrical practices.
He locates the source of the problem as the sixth century monk (Dionysius Exiguus
or Dennis the Short) who named the New Year after Jesus's birth as the year one rather than the year zero.
In 530AD a monk, Dionysius Exiguus
, was commissioned to fix the day and year of the birth of Jesus and in 534AD December 25 was adopted which was reckoned by the law courts as "dies non".
A: The concept of the Christian Era was invented by a man called Dionysius Exiguus
(c.500 to 550AD) in about 525, at the request of Pope St John I.
This date is based on the now globally recognized Gregorian calendar, the initial epoch of which was established by the sixth-century scholar Dionysius Exiguus
, who was compiling a table of dates of Easter.
"This date is based on a now globally recognized calendar established by the sixth-century scholar Dionysius Exiguus
," according to the observatory.
John I, Dionysius Exiguus
, a Scythian monk, proposed the concept.
When the Gregorian calendar was established by the sixth-century scholar Dionysius Exiguus
, he started with Jan.
The method of reckoning the Christian Era dates back to the sixth century AD when a monk called Dionysius Exiguus
, who was also a mathematician and astronomer, worked out the chronology.
Later studies discovered that Dionysius Exiguus
had erred in his basic calculation.
The obscure monk is Dionysius Exiguus
who in 525 was summoned by the Pope to calculate the date of Easter.
So Dionysius Exiguus
had to work backwards on whatever evidence he could find.