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A comment on In 1000 BC the summer solstice was on July 2nd [pdf].

Re:In 1000 BC the summer solstice was on July 2nd [pdf] by NoCowLevel on Tuesday January 28, 2014 @01:36AM (#7135703)
1581 AD 10 Mar 18:01 11 Jun 19:34 13 Sep 06:54 11 Dec 20:06 00:02

1582 AD 10 Mar 23:56 12 Jun 01:30 13 Sep 12:39 22 Dec 01:54 00:02

1583 AD 21 Mar 05:51 22 Jun 07:16 23 Sep 18:24 22 Dec 07:42 00:02

Looks the single most dramatic shift happened in these two years. Would someone with astronomical chops care to explain a bit?

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Re:In 1000 BC the summer solstice was on July 2nd [pdf] by powera on Tuesday January 28, 2014 @01:38AM (#7135709)
http://en.wikipedia.org/wiki/Gregorian_calendar

"Four Catholic countries—Spain,[18] Portugal, the Polish–Lithuanian Commonwealth, and most of Italy—implemented the new calendar on the date specified by the bull, with Julian Thursday, 4 October 1582, being followed by Gregorian Friday, 15 October 1582."

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