Common year starting on Sunday

Type of year A on a solar calendar according to its starting and ending days in the week

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,[1] 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

Calendar for any common year starting on Sunday,
presented as common in many English-speaking areas
January
Su Mo Tu We Th Fr Sa
01 02 03 04 05 06 07
08 09 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31  
 
February
Su Mo Tu We Th Fr Sa
01 02 03 04
05 06 07 08 09 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28  
 
March
Su Mo Tu We Th Fr Sa
01 02 03 04
05 06 07 08 09 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31  
 
April
Su Mo Tu We Th Fr Sa
01
02 03 04 05 06 07 08
09 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30  
May
Su Mo Tu We Th Fr Sa
01 02 03 04 05 06
07 08 09 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31  
 
June
Su Mo Tu We Th Fr Sa
01 02 03
04 05 06 07 08 09 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30
 
July
Su Mo Tu We Th Fr Sa
01
02 03 04 05 06 07 08
09 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29
30 31  
August
Su Mo Tu We Th Fr Sa
01 02 03 04 05
06 07 08 09 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30 31  
 
September
Su Mo Tu We Th Fr Sa
01 02
03 04 05 06 07 08 09
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
 
October
Su Mo Tu We Th Fr Sa
01 02 03 04 05 06 07
08 09 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31  
 
November
Su Mo Tu We Th Fr Sa
01 02 03 04
05 06 07 08 09 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30  
 
December
Su Mo Tu We Th Fr Sa
01 02
03 04 05 06 07 08 09
10 11 12 13 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
31  
ISO 8601-conformant calendar with week numbers for
any common year starting on Sunday (dominical letter A)
January
Wk Mo Tu We Th Fr Sa Su
52 01
01 02 03 04 05 06 07 08
02 09 10 11 12 13 14 15
03 16 17 18 19 20 21 22
04 23 24 25 26 27 28 29
05 30 31  
February
Wk Mo Tu We Th Fr Sa Su
05 01 02 03 04 05
06 06 07 08 09 10 11 12
07 13 14 15 16 17 18 19
08 20 21 22 23 24 25 26
09 27 28  
   
March
Wk Mo Tu We Th Fr Sa Su
09 01 02 03 04 05
10 06 07 08 09 10 11 12
11 13 14 15 16 17 18 19
12 20 21 22 23 24 25 26
13 27 28 29 30 31  
   
April
Wk Mo Tu We Th Fr Sa Su
13 01 02
14 03 04 05 06 07 08 09
15 10 11 12 13 14 15 16
16 17 18 19 20 21 22 23
17 24 25 26 27 28 29 30
   
May
Wk Mo Tu We Th Fr Sa Su
18 01 02 03 04 05 06 07
19 08 09 10 11 12 13 14
20 15 16 17 18 19 20 21
21 22 23 24 25 26 27 28
22 29 30 31  
   
June
Wk Mo Tu We Th Fr Sa Su
22 01 02 03 04
23 05 06 07 08 09 10 11
24 12 13 14 15 16 17 18
25 19 20 21 22 23 24 25
26 26 27 28 29 30  
   
July
Wk Mo Tu We Th Fr Sa Su
26 01 02
27 03 04 05 06 07 08 09
28 10 11 12 13 14 15 16
29 17 18 19 20 21 22 23
30 24 25 26 27 28 29 30
31 31  
August
Wk Mo Tu We Th Fr Sa Su
31 01 02 03 04 05 06
32 07 08 09 10 11 12 13
33 14 15 16 17 18 19 20
34 21 22 23 24 25 26 27
35 28 29 30 31  
   
September
Wk Mo Tu We Th Fr Sa Su
35 01 02 03
36 04 05 06 07 08 09 10
37 11 12 13 14 15 16 17
38 18 19 20 21 22 23 24
39 25 26 27 28 29 30
   
October
Wk Mo Tu We Th Fr Sa Su
39 01
40 02 03 04 05 06 07 08
41 09 10 11 12 13 14 15
42 16 17 18 19 20 21 22
43 23 24 25 26 27 28 29
44 30 31  
November
Wk Mo Tu We Th Fr Sa Su
44 01 02 03 04 05
45 06 07 08 09 10 11 12
46 13 14 15 16 17 18 19
47 20 21 22 23 24 25 26
48 27 28 29 30  
   
December
Wk Mo Tu We Th Fr Sa Su
48 01 02 03
49 04 05 06 07 08 09 10
50 11 12 13 14 15 16 17
51 18 19 20 21 22 23 24
52 25 26 27 28 29 30 31
   

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.

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

400 year cycle

century 1: 6, 17, 23, 34, 45, 51, 62, 73, 79, 90

century 2: 102, 113, 119, 130, 141, 147, 158, 169, 175, 186, 197

century 3: 209, 215, 226, 237, 243, 254, 265, 271, 282, 293, 299

century 4: 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 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.

Julian common years starting on Sunday
Decade 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th
15th century 1402 1413 1419 1430 1441 1447 1458 1469 1475 1486 1497
16th century 1503 1514 1525 1531 1542 1553 1559 1570 1581 1587 1598
17th century 1609 1615 1626 1637 1643 1654 1665 1671 1682 1693 1699
18th century 1710 1721 1727 1738 1749 1755 1766 1777 1783 1794
19th century 1805 1811 1822 1833 1839 1850 1861 1867 1878 1889 1895
20th century 1906 1917 1923 1934 1945 1951 1962 1973 1979 1990
21st century 2001 2007 2018 2029 2035 2046 2057 2063 2074 2085 2091

Holidays

International

Roman Catholic Solemnities

Australia and New Zealand

British Isles

Canada

United States

References

  1. 1.0 1.1 Robert van Gent (2017). "The Mathematics of the ISO 8601 Calendar". Utrecht University, Department of Mathematics. Retrieved 20 July 2017.