Common year starting on Sunday

Common year starting on Sunday
A common year starting on Sunday is any non-leap year (i.e. a year with 365 days) that begins on Sunday, 1 January, and ends on Sunday, 31 December. Its dominical letter hence is A. The current year, 2023, is a common year starting on Sunday in the Gregorian calendar. The last such year was 2017 and the next one will be 2034 in the Gregorian calendar, or, likewise, 2018 and 2029 in the obsolete Julian calendar, see below for more.
Any common year that starts on Sunday, Monday or Tuesday has two Friday the 13ths: those two in this common year occur in January and October.
This is the only common year with three occurrences of Friday the 17th: those three in this common year occur in February, March, and November. Leap years starting on Wednesday share this characteristic, for the months January, April and July. From February until March in this type of year is also the shortest period (one month) that runs between two instances of Friday the 17th.
Calendars
Applicable years
Gregorian Calendar
In the (currently used) Gregorian calendar, alongside Monday, Wednesday, Friday 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 Sunday. 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). A leap year has two adjoining dominical letters (one for January and February and the other for March to December, as 29 February has no letter). 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 11, 22 and 28 of the cycle are common years beginning on Sunday. 2017 is year 10 of the cycle. Approximately 10.71% of all years are common years beginning on Sunday.
Holidays
International
Valentine's Day falls on a Tuesday
World Day for Grandparents and the Elderly falls on July 23
Halloween falls on a Tuesday
Christmas Day falls on a Monday
Roman Catholic Solemnities
Epiphany falls on a Friday
Candlemas falls on a Thursday
Saint Joseph's Day falls on a Sunday
The Annunciation of Jesus falls on a Saturday
The Nativity of John the Baptist falls on a Saturday
The Solemnity of Saints Peter and Paul falls on a Thursday
The Transfiguration of Jesus falls on a Sunday
The Assumption of Mary falls on a Tuesday
The Exaltation of the Holy Cross falls on a Thursday
All Saints' Day falls on a Wednesday
All Souls' Day falls on a Thursday
The Feast of Christ the King falls on its latest possible date, November 26 (or on October 29 in versions of the calendar between 1925 and 1962)
The First Sunday of Advent falls on its latest possible date, December 3
The Immaculate Conception falls on a Friday
Gaudete Sunday falls on its latest possible date, December 17
Rorate Sunday falls on its latest possible date, December 24
Australia and New Zealand
Australia Day falls on a Thursday
Waitangi Day falls on a Monday
Daylight saving ends on April 2
ANZAC Day falls on a Tuesday
Mother's Day falls on its latest possible date, May 14
Father's Day falls on September 3
Daylight saving begins on its earliest possible date, September 24 in New Zealand and October 1 in Australia
British Isles
Saint David's Day falls on a Wednesday
Mother's Day falls on March 5, March 12, March 19, March 26 or April 2
Daylight saving begins on March 26
Saint Patrick's Day falls on a Friday
Saint George's Day falls on a Sunday
Father's Day falls on June 18
Orangeman's Day falls on a Wednesday
Daylight saving ends on October 29
Guy Fawkes Night falls on a Sunday
Saint Andrew's Day falls on a Thursday
Canada
Daylight saving begins on March 12
Mother's Day falls on its latest possible date, May 14
Victoria Day falls on May 22
Father's Day falls on June 18
Canada Day falls on a Saturday
Labour Day falls on September 4
Thanksgiving Day falls on October 9
Daylight saving ends on November 5
United States
Martin Luther King Jr. Day falls on January 16
President's Day falls on February 20
Daylight saving begins on March 12
Mother's Day falls on its latest possible date, May 14
Memorial Day falls on May 29
Father's Day falls on June 18
Juneteenth falls on a Monday
Independence Day falls on a Tuesday
Labor Day falls on September 4
Grandparents' Day falls on September 10
Columbus Day falls on October 9
Daylight saving ends on November 5
Thanksgiving Day falls on November 23
References
Gregorian calendar
Julian calendar
Sunday