Gregorian Calendar
On October 4th 1582 the Gregorian calendar was
introduced by Pope Gregory XIII. It was designed to replace the Julian calendar
which had been introduced by Julius Caesar and was slowly becoming more
inaccurate.
This had amounted to 14
days by Pope Gregory’s time, he based his reform on restoration of the vernal
equinox, then falling on March 11, to the date (March 21) it had in ad 325, the
time of the Council of Nicaea, and not on the date of the equinox at the time
of the birth of Christ, when it fell on March 25.
The change was effected by
advancing the calendar 10 days after Oct. 4, 1582, the day following being
reckoned as October 15.
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