Common year starting on Friday

Common year starting on Friday
A common year starting on Friday is any non-leap year (i.e. a year with 365 days) that begins on Friday, 1 January, and ends on Friday, 31 December. Its dominical letter hence is C. The most recent year of such kind was 2021 and the next one will be 2027 in the Gregorian calendar, or, likewise, 2011, 2022 and 2033 in the obsolete Julian calendar, see below for more. This common year is one of the three possible common years in which a century year can begin on, and occurs in century years that yield a remainder of 100 when divided by 400. The most recent such year was 1700 and the next one will be 2100.
Any common year that starts on Wednesday, Friday or Saturday has only one Friday the 13th: the only one in this common year occurs in August. Leap years starting on Thursday share this characteristic, but also have another one in February.
From July of the year that precedes this year until September in this type of year is the longest period (14 months) that occurs without a Friday the 17th. Leap years starting on Tuesday share this characteristic, from August of the common year that precedes it to October in that type of year.
Calendars
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.
Applicable years
Gregorian calendar
In the (currently used) Gregorian calendar, alongside Sunday, Monday, Wednesday or Saturday, the fourteen types of year (seven common, seven leap) repeat in a 400-year cycle (20871 weeks). Forty-three common years per cycle or exactly 10.75% start on a Friday. The 28-year sub-cycle only spans across century years divisible by 400, e.g. 1600, 2000, and 2400.
Julian calendar
In the now-obsolete Julian calendar, the fourteen types of year (seven common, seven leap) repeat in a 28-year cycle (1461 weeks). This sequence occurs exactly once within a cycle, and every common letter thrice.
As the Julian calendar repeats after 28 years that means it will also repeat after 700 years, i.e. 25 cycles. The year's position in the cycle is given by the formula ((year + 8) mod 28) + 1). Years 4, 15 and 26 of the cycle are common years beginning on Friday. 2017 is year 10 of the cycle. Approximately 10.71% of all years are common years beginning on Friday.
Holidays
International
Valentine's Day falls on a Sunday
World Day for Grandparents and the Elderly falls on July 25
Halloween falls on a Sunday
Christmas Day falls on a Saturday
Roman Catholic Solemnities
Epiphany falls on a Wednesday
Candlemas falls on a Tuesday
Saint Joseph's Day falls on a Friday
The Annunciation of Jesus falls on a Thursday
The Nativity of John the Baptist falls on a Thursday
The Solemnity of Saints Peter and Paul falls on a Tuesday
The Transfiguration of Jesus falls on a Friday
The Assumption of Mary falls on a Sunday
The Exaltation of the Holy Cross falls on a Tuesday
All Saints' Day falls on a Monday
All Souls' Day falls on a Tuesday
The Feast of Christ the King falls on November 21 (or on its latest possible date of October 31 in versions of the calendar between 1925 and 1962)
The First Sunday of Advent falls on November 28
The Immaculate Conception falls on a Wednesday
Gaudete Sunday falls on December 12
Rorate Sunday falls on December 19
Australia and New Zealand
Australia Day falls on a Tuesday
Waitangi Day falls on a Saturday
Daylight saving ends on April 4
ANZAC Day falls on a Sunday, and in some years coincides with Easter Sunday falling on its latest possible date
Mother's Day falls on May 9
Father's Day falls on September 5
Daylight saving begins on September 26 in New Zealand and October 3 in Australia
British Isles
Saint David's Day falls on a Monday
Mother's Day falls on March 7, March 14, March 21, March 28 or on its latest possible date of April 4
Daylight saving begins on March 28
Saint Patrick's Day falls on a Wednesday
Saint George's Day falls on a Friday, and in some years coincides with Good Friday falling on its latest possible date
Father's Day falls on June 20
Orangeman's Day falls on a Monday
Daylight saving ends on its latest possible date, October 31
Guy Fawkes Night falls on a Friday
Saint Andrew's Day falls on a Tuesday
Canada
Daylight saving begins on its latest possible date, March 14
Mother's Day falls on May 9
Victoria Day falls on its latest possible date, May 24
Father's Day falls on June 20
Canada Day falls on a Thursday
Labour Day falls on September 6
Thanksgiving Day falls on October 11
Daylight saving ends on its latest possible date, November 7
United States
Martin Luther King Jr. Day falls on January 18
President's Day falls on its earliest possible date, February 15
Daylight saving begins on its latest possible date, March 14
Mother's Day falls on May 9
Memorial Day falls on its latest possible date, May 31
Juneteenth falls on a Saturday
Father's Day falls on June 20
Independence Day falls on a Sunday
Labor Day falls on September 6
Grandparents' Day falls on September 12
Columbus Day falls on October 11
Daylight saving ends on its latest possible date, November 7
Thanksgiving Day falls on November 25
References
Gregorian calendar
Julian calendar
Friday