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The Gregorian calendar reform also dealt with the accumulated difference between these figures, between the years 3 (1752 in the British Empire), by skipping 10 dates (11 in the case of Great Britain, including her colonies and Ireland) to restore the date of the vernal equinox to approximately March 21, the approximate date it occurred at the time of the First Council of Nicea in 325.
However, the two events were combined in the late 18th century, and continue to be celebrated into modern times as "The Twelfth".This article is about the 18th-century changes in calendar conventions used by Great Britain and its colonies, together with a brief explanation of usage of the term in other contexts. S.) are terms sometimes used with dates to indicate that the calendar convention used at the time described is different from that in use at the time the document was being written.For a more general discussion of the equivalent transitions in other countries, see Adoption of the Gregorian calendar. There were two calendar changes in Great Britain and its colonies, which may sometimes complicate matters: the first was to change the start of the year from Lady Day (25 March) to 1 January; the second was to discard the Julian calendar in favour of the Gregorian calendar.This maps to 11 July (Gregorian calendar), conveniently close to the Julian date of the subsequent [and more decisive] Battle of Aughrim on 12 July 1691.This latter battle was commemorated annually throughout the eighteenth century on 12 July, following the usual historical convention of commemorating events of that period within Great Britain and Ireland by mapping the Julian date directly onto the modern Gregorian calendar date (as happens for example with Guy Fawkes Night on 5 November).