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Origins of our calendar

Caesar's reform offered the Romans a calendar which was really quite exact. However, the accumulation of the error of approximately one quarter-of-a-day per year caused a clear movement of the calendar over the centuries. The spring festival occasionally taking place in Autumn.

Caesar was responsible as Pontifex maximus for the proclamation of the "calenden" – the word "calendar" comes from this "calenden"! He was therefore the calendar specialist and knew of a failed calendar reform in Egypt. In the year 238 bc, the Egyptian king Ptolemäus III Euergetes had issued the

Decree of Canopus

which stipulated the addition of one day every 4 years.
Julius Caesar adopted this calendar addition in the year of 46 bc.

This, later named after him,

Julian Calendar

was allowed to prevail. However, because the year was 11 minutes and 14 seconds too long, there was still the undesired movement of the beginning of spring over a long period of time.

The Julian year lasted 365,2500 instead of 365,2422 days.

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