Goldilocks, Pope Gregory in 1582 adjusted the calendar by removing 10 days and declaring that century years must not only be divisible by 100 but also by 400 to be a leap year such that years 1700, 1800 and 1900 lost a day making currently 10 + 3 = 13 days difference, so Nitel is Jan 5 night and not Jan 24 night.
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