The Julian calendar.

seems odd, strange and paradoxical, but the days between 1 and 15 October 1582,

do not exist! The explanation of this temporal gap lies in a fault that

Julius Caesar(between 100 years and 44 years before Christ) committed
to develop,

by the end and philosopher of Alexandria, Sosigenes,known as Julian Calendar

after the gobernante- which was established in all regions of the Roman Empire in

forty-six BC. Based on the solar motion fixed duration almanac

year at 365, 25 days spread over

12 months containing 30 and 31 days, except February, which has 28 days, except in the

years bisiestos- one in four-, In those who are 29.

This is a similar timetable to whichapply today, but not exactly the same.

And in 1582 it was modified in some precepts, as Julius Caesar and Sosígenes had

made a miscalculation in preparing the almanac (in only 11 minutes and 14 seconds)

that had caused the mid-sixteenth century, the calendar take an advance of 10 days

prior seasons.

Pope Gregory XIII (1502- 1585) conducted a review of the Julian calendar which brought

some change. Among them, the gap of 10 days with respect to reality,

the Pope decided cut their losses and eliminate the almanac of 1582 10 days, those

between 5 and 15 October. So, this year, citizens lay down on May 1st of October and

lifted the following day 15th.

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