View source for Common year starting on Sunday

{{Short description|none}}
A '''common year starting on Sunday''' is any non-[[leap year]] (i.e. a year with 365 days) that begins on [[Sunday]], [[January 1|1 January]], and ends on [[Sunday]], [[December 31|31 December]]. Its [[dominical letter]] hence is '''A'''. The most recent year of such kind was [[2023]], and the next one will be [[2034]] in the [[Gregorian calendar]],<ref name="math">{{cite web|url=https://webspace.science.uu.nl/~gent0113/calendar/isocalendar.htm |author=Robert van Gent |title=The Mathematics of the ISO 8601 Calendar |publisher=Utrecht University, Department of Mathematics |date=2017 |accessdate=20 July 2017}}</ref> or, likewise, [[2018]] and [[2029]] in the obsolete [[Julian calendar]], see [[#Applicable years|below for more]].

Any [[common year]] that starts on a Sunday has two [[Friday the 13th]]s: those two in this common year [[January 13|occur in January]] and [[October 13|October]].

This year has four months (January, April, July and October) which begin on a weekend-day.

== Calendars ==
<!-- To avoid arbitrary years, use the most recent year of this type. 2023 was the most recent year of this type. -->
{{calendar|year=2023|show_year=off|title=Calendar for any [[common year]] starting on Sunday,<br />presented as common in many English-speaking areas}}

{{calendar|year=2023|show_year=off|format=iso|row=3|zero=0|title=[[ISO 8601]]-conformant calendar with [[ISO week date|week numbers]] for<br />any common year starting on Sunday (dominical letter A)}}

== Applicable years ==

=== Gregorian Calendar ===
In the (currently used) Gregorian calendar, alongside [[Common year starting on Monday|Monday]], [[Common year starting on Wednesday|Wednesday]], [[Common year starting on Friday|Friday]] or [[Common year starting on Saturday|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.

{| class="wikitable"
|+ Gregorian common years starting on Sunday<ref name="math"/>
!scope=row| Century
! 1st !!colspan=2| 2nd !! 3rd !!colspan=2| 4th !!colspan=2| 5th !! 6th !!colspan=2| 7th !!colspan=2| 8th !! 9th !!colspan=2| 10th
|- style="opacity: 0.5;"
! style="background-color:#efefef;" | [[16th century]]
|colspan=13| ''prior to first adoption (proleptic)'' || [[1589]] ||colspan=2| [[1595]]
|- style="opacity: 0.5;"
! style="background-color:#efefef;" | [[17th century]]
| [[1606]] ||colspan=2| [[1617]] || [[1623]] ||colspan=2| [[1634]] ||colspan=2| [[1645]] || [[1651]] ||colspan=2| [[1662]] || [[1673]] || [[1679]] || — ||colspan=2| [[1690]]
|-
! style="background-color:#efefef;" | [[18th century]]
| [[1702]] || [[1713]] || [[1719]] || — ||colspan=2| [[1730]] || [[1741]] || [[1747]] || [[1758]] ||colspan=2| [[1769]] ||colspan=2| [[1775]] || [[1786]] ||colspan=2| [[1797]]
|-
! style="background-color:#efefef;" | [[19th century]]
| [[1809]] ||colspan=2| [[1815]] || [[1826]] ||colspan=2| [[1837]] ||colspan=2| [[1843]] || [[1854]] ||colspan=2| [[1865]] ||colspan=2| [[1871]] || [[1882]] || [[1893]] || [[1899]]
|-
! style="background-color:#efefef;" | [[20th century]]
| [[1905]] ||colspan=2| [[1911]] || [[1922]] || [[1933]] || [[1939]] ||colspan=2| — || [[1950]] || [[1961]] || [[1967]] ||colspan=2| [[1978]] || [[1989]] ||colspan=2| [[1995]]
|-
! style="background-color:#efefef;" | [[21st century]]
| [[2006]] ||colspan=2| [[2017]] || [[2023]] ||colspan=2| [[2034]] ||colspan=2| [[2045]] || [[2051]] ||colspan=2| [[2062]] || [[2073]] || [[2079]] || — ||colspan=2| [[2090]]
|-
! style="background-color:#efefef;" | [[22nd century]]
| [[2102]] || [[2113]] || [[2119]] || — ||colspan=2| [[2130]] || [[2141]] || [[2147]] || [[2158]] ||colspan=2| [[2169]] ||colspan=2| [[2175]] || [[2186]] ||colspan=2| [[2197]]
|-
! style="background-color:#efefef;" | [[23rd century]]
| [[2209]] ||colspan=2| [[2215]] || [[2226]] ||colspan=2| [[2237]] ||colspan=2| [[2243]] || [[2254]] ||colspan=2| [[2265]] ||colspan=2| [[2271]] || [[2282]] || [[2293]] || [[2299]]
|-
! style="background-color:#efefef;" | [[24th century]]
 | [[2305]] ||colspan=2| [[2311]] || [[2322]] || [[2333]] || [[2339]] ||colspan=2| — || [[2350]] || [[2361]] || [[2367]] ||colspan=2| [[2378]] || [[2389]] ||colspan=2| [[2395]]
|-
|}

{| class="wikitable"
|+ 400-year cycle
|-
! 0–99
| 6 || 17 || 23 || 34 || 45 || 51 || 62 || 73 || 79 || 90 ||
|-
! 100–199
| 102 || 113 || 119 || 130 || 141 || 147 || 158 || 169 || 175 || 186 || 197
|-
! 200–299
| 209 || 215 || 226 || 237 || 243 || 254 || 265 || 271 || 282 || 293 || 299
|-
! 300–399
| 305 || 311 || 322 || 333 || 339 || 350 || 361 || 367 || 378 || 389 || 395
|}

=== Julian Calendar ===
In the now-obsolete Julian calendar, the fourteen types of year (seven common, seven leap) repeat in a [[solar cycle (calendar)|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.

{| class="wikitable"
|+ Julian common years starting on Sunday
!scope=row| Decade
!colspan=2| 1st !!colspan=2| 2nd !!colspan=2| 3rd !!colspan=2| 4th !!colspan=2| 5th !!colspan=2| 6th !!colspan=2| 7th !!colspan=2| 8th !!colspan=2| 9th !!colspan=2| 10th
|-
! style="background-color:#efefef;" | 15th century
|colspan=2| [[1402]] || [[1413]] || [[1419]] ||colspan=2| [[1430]] ||colspan=2| — || [[1441]] || [[1447]] ||colspan=2| [[1458]] ||colspan=2| [[1469]] ||colspan=2| [[1475]] ||colspan=2| [[1486]] ||colspan=2| [[1497]]
|-
! style="background-color:#efefef;" | 16th century
|colspan=2| [[1503]] ||colspan=2| [[1514]] ||colspan=2| [[1525]] ||colspan=2| [[1531]] ||colspan=2| [[1542]] || [[1553]] || [[1559]] ||colspan=2| [[1570]] ||colspan=2| — || [[1581]] <!-- Wikipedia year articles refer to Gregorian years from 1582 --> || 1587 ||colspan=2| 1598
|-
! style="background-color:#efefef;" | 17th century
|colspan=2| 1609 ||colspan=2| 1615 ||colspan=2| 1626 ||colspan=2| 1637 ||colspan=2| 1643 ||colspan=2| 1654 ||colspan=2| 1665 ||colspan=2| 1671 ||colspan=2| 1682 || 1693 || 1699
|-
! style="background-color:#efefef;" | 18th century
|colspan=2| 1710 ||colspan=2| — || 1721 || 1727 ||colspan=2| 1738 ||colspan=2| 1749 ||colspan=2| 1755 ||colspan=2| 1766 ||colspan=2| 1777 ||colspan=2| 1783 ||colspan=2| 1794
|-
! style="background-color:#efefef;" | 19th century
|colspan=2| 1805 ||colspan=2| 1811 ||colspan=2| 1822 || 1833 || 1839 ||colspan=2| 1850 ||colspan=2| — || 1861 || 1867 ||colspan=2| 1878 ||colspan=2| 1889 ||colspan=2| 1895
|-
! style="background-color:#efefef;" | 20th century
|colspan=2| 1906 ||colspan=2| 1917 ||colspan=2| 1923 ||colspan=2| 1934 ||colspan=2| 1945 ||colspan=2| 1951 ||colspan=2| 1962 || 1973 || 1979 ||colspan=2| 1990 ||colspan=2| —
|-
! style="background-color:#efefef;" | 21st century
| 2001 || 2007 ||colspan=2| 2018 ||colspan=2| 2029 ||colspan=2| 2035 ||colspan=2| 2046 ||colspan=2| 2057 ||colspan=2| 2063 ||colspan=2| 2074 ||colspan=2| 2085 ||colspan=2| 2091
|}

== Holidays ==
=== International ===
* [[Valentine's Day]] falls on a [[Tuesday]]
* [[Grandparents' Day|World Day for Grandparents and the Elderly]] falls on [[July 23]]
* [[Halloween]] falls on a [[Tuesday]]
* [[Christmas Day]] falls on a [[Monday]]
* Earliest [[Easter Sunday]] falls on [[March 26]], latest [[Easter Sunday]] falls on [[April 23]]

=== Roman Catholic Solemnities ===
* [[Epiphany (holiday)|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 (Canada)|Labour Day]] falls on [[September 4]]
* [[Thanksgiving Day (Canada)|Thanksgiving Day]] falls on [[October 9]]
* Daylight saving ends on [[November 5]]

=== Denmark ===
* The [[Constitution Day (Denmark)|Constitution Day]] falls on a [[Monday]]

=== Germany ===
* The [[German reunification|reunification]] falls on a [[Thursday]]

=== 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 (United States)|Independence Day]] falls on a [[Tuesday]]
* [[Labor Day (United States)|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==
{{reflist}}
{{List of calendars}}
{{DEFAULTSORT:Common Year Starting On Sunday}}
[[Category:Gregorian calendar]]
[[Category:Julian calendar]]
[[Category:Sunday]]