7 Comments
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Jill Swenson's avatar

I have always found this switch to the Gregorian calendar an interesting turning point in history. Good reminder re dates.

Teresa's avatar

But we still have 365 day years with every fourth one a leap year...so how are we not gaining a day every 128 years? How did Pope Gregory change the calendar so it doesn't do that?

I've never really thought about it - I just knew about the change and how to adjust my dating.

Jane Chapman's avatar

The United Kingdom and its colonies switched to the Gregorian calendar following an Act of Parliament in 1752. Realigning the calendar consistent with the astronomical calendar required a loss of 11 days. This meant that, 2 September 1752 advanced to 14 September 1752 with the 3rd to the 13th September 1752 skipped.

Teresa's avatar

Yes, I already understand that.

But if the reason the Julian calendar of 365 days to a year with every 4th year a leap year with one extra day required changing because a day was added every 128 years, why does our current calendar of 365 days/yr with every fourth year a leap year and one extra day not result in the same?

Jane Chapman's avatar

Sorry Teresa ... I misinterpreted your question ... As Deborah has said, the Gregorian calendar allows for an adjustment from time to time to bring us back into line.

Deborah Carl's avatar

The leap year rule is more complicated than one every four years. "There is a leap year every year whose number is perfectly divisible by four -- except for years which are both divisible by 100 and not divisible by 400." https://astro101.wwu.edu/a101_leapyear.html

I just do what the calendar says. The last time we skipped a leap year was 1900.

Teresa's avatar

Ah, that makes more sense...one of my great-great-grandmothers was a Leap Year baby in 1852...born 29 Feb.