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, 2017, is a common year starting on Sunday in the Gregorian calendar. The last such year was 2006 and the next such year will be 2023 in the Gregorian calendar,[6] or, likewise, 2007 and 2018 in the obsolete Julian calendar, see . Any common year that starts on Sunday, Monday or Tuesday has two Friday the 13ths. This common year contains two Friday the 13ths in January and October.

Calendars

Calendar for any common year starting on Sunday,
presented as common in many English-speaking areas

01020304050607
08091011121314
15161718192021
22232425262728
293031 
 
01020304
05060708091011
12131415161718
19202122232425
262728 
 
01020304
05060708091011
12131415161718
19202122232425
262728293031 
 
01
02030405060708
09101112131415
16171819202122
23242526272829
30 
010203040506
07080910111213
14151617181920
21222324252627
28293031 
 
010203
04050607080910
11121314151617
18192021222324
252627282930
 
01
02030405060708
09101112131415
16171819202122
23242526272829
3031 
0102030405
06070809101112
13141516171819
20212223242526
2728293031 
 
0102
03040506070809
10111213141516
17181920212223
24252627282930
 
01020304050607
08091011121314
15161718192021
22232425262728
293031 
 
01020304
05060708091011
12131415161718
19202122232425
2627282930 
 
0102
03040506070809
10111213141516
17181920212223
24252627282930
31 


ISO 8601-conformant calendar with week numbers for
any common year starting on Sunday (dominical letter A)

01
02030405060708
09101112131415
16171819202122
23242526272829
3031 
0102
03040506070809
10111213141516
17181920212223
24252627282930
 
0102
03040506070809
10111213141516
17181920212223
24252627282930
31 
01
02030405060708
09101112131415
16171819202122
23242526272829
3031 
0102030405
06070809101112
13141516171819
20212223242526
2728 
 
01020304050607
08091011121314
15161718192021
22232425262728
293031 
 
010203040506
07080910111213
14151617181920
21222324252627
28293031 
 
0102030405
06070809101112
13141516171819
20212223242526
27282930 
 
0102030405
06070809101112
13141516171819
20212223242526
2728293031 
 
01020304
05060708091011
12131415161718
19202122232425
2627282930 
 
010203
04050607080910
11121314151617
18192021222324
252627282930
 
010203
04050607080910
11121314151617
18192021222324
25262728293031
 

Applicable years

Gregorian Calendar

In the (currently used) Gregorian calendar, 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 does only span across century years divisible by 400, e.g. 1600, 2000, and 2400.

Gregorian common years starting on Sunday[6]
Decade1st2nd3rd4th5th6th7th8th9th10th
16th centuryprior to first adoption (proleptic)15891595
17th century1606161716231634164516511662167316791690
18th century17021713171917301741174717581769177517861797
19th century18091815182618371843185418651871188218931899
20th century19051911192219331939195019611967197819891995
21st century2006201720232034204520512062207320792090

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
Decade1st2nd3rd4th5th6th7th8th9th10th
15th century14021413141914301441144714581469147514861497
16th century15031514152515311542155315591570158115871598
17th century16091615162616371643165416651671168216931699
18th century1710172117271738174917551766177717831794
19th century18051811182218331839185018611867187818891895
20th century1906191719231934194519511962197319791990
21st century20012007201820292035204620572063207420852091