This is the calendar for any common year starting on Friday (dominical letter C). Examples: Gregorian years 1999, 2021 & 2010 or Julian years 1910 & 1899 (see bottom tables).
A common year is a year with 365 days, i.e. not a leap year.
This is the only year type where the nth "Doomsday" (this year Sunday) is not in ISO week n; it is in ISO week n-1.