To this series recurring in regular succession there was added in the intercalaryyear a nameless "labour-month" (-mercedonius-) at the close of the year, viz.
2
The intercalaryyears of the cycle are distinguished by an asterisk.
1
The year 2000 is a leapyear, and there is no alteration.
2
The euro zone, come the next leapyear, is looking smaller and smaller.
3
The leapyear accounts for the two-day difference in the dates.
4
A busy February 29 this leapyear also helped the tally.