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Although Greek astronomers had known, at least since Hipparchus, a century before the Julian reform, that the tropical year was slightly shorter than 365.25 days, the calendar did not compensate for this difference.As a result, the calendar year gains about three days every four centuries compared to observed equinox times and the seasons.

This means since 16 February Julian (1 March 1900 Gregorian) and until 15 February Julian (28 February 2100 Gregorian) Julian is 13 days behind Gregorian and the disparity will widen.

The Julian calendar has been replaced as the civil calendar by the Gregorian calendar in all countries which officially used it.

An analog, the Alexandrian calendar, is the basis for the Ethiopian calendar, which is the civil calendar of Ethiopia.

Egypt converted on 20 December 1874/1 January 1875.

So far as can be determined from the historical evidence, they were much less regular than these ideal schemes suggest.

They usually occurred every second or third year, but were sometimes omitted for much longer, and occasionally occurred in two consecutive years.

Caesar's reform was intended to solve this problem permanently, by creating a calendar that remained aligned to the sun without any human intervention.

This proved useful very soon after the new calendar came into effect.

Turkey switched (for fiscal purposes) on 16 February/1 March 1917. Greece made the change for civil purposes on 16 February/1 March 1923, but the next national day (25 March)—a religious holiday—took place as if on the old calendar.

Most Christian denominations in the west and areas evangelised by western churches have made the same change for their liturgical calendars.

For these reasons, the last years of the pre-Julian calendar were later known as "years of confusion".

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