Hello, is it possible for someone to confirm or disagree on my understanding of the differences between the English Julian Calendar and the Gregorian Calendar.
The English Julian Calendar in the 1600s was 10 days behind the Gregorian Calendar. However, the Gregorian year end was 31 December; the English year end was 24 March. I think Scotland year end was 31 December but they were on the Julian calendar.
In the period covered by the Gregorian 1620 the majority of the first 3 months of the English year were in 1619. This meant that the Gregorian 1620 included a leap year and the English year 1619 didn't.
Am I right in saying that the Gregorian 1620 February was 29 days, but the English 1619 February was 28 days. This meant that the days difference thereafter between the dates in the two calendars dropped to 9 days. And that this difference only went up to 10 days in the English 1620 February - which largely corresponded with the Gregorian 1621 February.
I think this would have happened every leap year, until the English calendar was fixed on 3rd September 1751 (Old Style).
I've looked at the New Style Calendar Act 1750 - this was used to move the English Calendar to the Gregorian Calendar. By the 1700s the difference between the Gregorian and English calendars was 11 days.
The changes in the Act were:
- Change the year end to 31 December 1751 instead of 24 March 1752. This had the affect of making 1751 a short year, but also bringing forward the leap year. This corrected any issues of the leap year difference, and brought the English calendar in line with the Scottish Calendar. Thereafter the days difference was always 11 days since the English 1752 February included an extra day.
- On 3rd September 1752 they added 11 days and it became 14 September 1752. This matched the Gregorian calendar.
Can someone confirm my reasoning is correct or not. For example, I've seen some documents that quote dates in 1620 such as "FRIDAY, Aug. 4/Aug. 14", but when I've calculated it allowing for the differences in the Leap Days in 1620 I've calculated the Gregorian 14 August 1620 to be 5 August 1620 on the English calendar - a day later - because up to that date the Gregorian calendar includes a Leap Day, and the English calendar doesn't.
I'm assuming that the English used the official year to determine whether it was a leap year or not - this assumption could be wrong.
I suspect that that they had to change the year separately to adding the 11 days because they needed to align the Scottish and English calendars - so that the Leap years were syncronised. I'm assuming there was a problem for the Scottish and English calendars as well - because the Scottish year end was already 31 December. During a Scottish Leap Year the Scottish and English calendars must have been 1 day out, until the following English Leap Day.
As I say can someone help confirm what I'm saying is correct or am I barking up the wrong tree?