Your story: Why did 11 days disappear in 1752?

This was very confusing by itself, but added to this change was that New Year moved from March 25 to Jan1

Think how confusing this must have been to people used to thinking about a year running from March 25 to March 24, now they had to get used to the year running from Jan.

On the Julian calendar, named after Julius Caesar, the year would be 365 days and 6 hours long.

This Julian system, based on the movement of Earth around the sun, created a 365-day calendar year with a leap year every four years and a New Year’s date of Jan.

As it became possible to measure the length of the solar year more accurately, astronomers found that the Julian system exceeded the solar year by 11 minutes, or 24 hours every 131 years, and three days every 400 years1

Several centuries later, Europe begins to realize that the Julian calendar system had not perfectly calculated leap years and had caused the calendar dates to become out of sync with celestial and religious events.

In 1582, Pope Gregory XIII refined the Julian calendar mathematically to fix this mistake and created a new system that we now know as the Gregorian calendar.

Between 1582 and 1752 BOTH calendars, old and new style, were used in Europe in different locations – causing some rather perplexing dates for future researchers.

Since the Gregorian calendar accounted more accurately for leap years, it was 11 days ahead of the Julian calendar by 1752.

To correct this discrepancy and align all dates, 11 days had to be dropped when the switch was made1

These double dates occur only in JANUARY, FEBRUARY and MARCH – never in any other months and never after 1752?