AH Challenge: Sixtusian Calendar

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HelloLegend

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The Julian calendar is used by the Romans is 11 1/2 minutes longer than the actual solar year, and after a number of centuries the 11 1/2 minutes adds up.

By the 1400s, the calendar was a week behind. By 1582, a correction was made in the calendar, and the day after October 4, 1582 became October 15, 1582, with the leap day rule and the divisible by 400 exceptions.
And all became well again. Named for Gregory XIII, this became known as the "Gregorian" calendar... (still inaccurate by 23 seconds, affects will be felt 3000 years from now)

HOWEVER, in the previous century...

Pope Sixtus IV (who reigned from 1471 to 1484) first decided reform was needed and called the German astronomer Regiomontanus to Rome to advise him. Regiomontanus arrived in 1475, but unfortunately he died shortly afterward, and the pope's plans for reform died with him.

AH Challenge: Would the Sixtusian calendar have created any butterflies? Would that calendar be the same as kind of system the Greggy cal?
Think of a unique way, where if done improperly, the WORLD would be messed up big time!!!!!!!!! In advance: I have no ideas. If I think up something cool. I will post it just like everyone else.
 

HelloLegend

Banned
A Bigger AH CHALLENGE

Make the negative butterfly happen after 1900, even though the change was made several hundred years earlier.
 
Pope Sixtus is prior to the Protestant Reformation, so this calendar is adopted throughout Western Christiandom... that's got to have some effects.
 
When would New Year's be on this Sistine Calendar? First of January, twenty-somethingth of March, or First of April?
 

HelloLegend

Banned
This is a challenge thread, you tell me when the first day of New Year is, and why it is that way if not Jan 1st.
 
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