User:Elphion/sandbox

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Section A

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The length of a day is also occasionally changed by the insertion of leap seconds into Coordinated Universal Time (UTC), owing to the variability of Earth's rotational period. Unlike leap days, leap seconds are not introduced on a regular schedule, since the variability in the length of the day is not entirely predictable.

The small inaccuracy in the length of the day assumed by the Gregorian calendar – and the fact that the true length is gradually increasing – will eventually (over the course of thousands of years) affect the accuracy of the Gregorian leap year rule.