Common year starting on Sunday


A common year starting on Sunday is any non-leap year that begins on Sunday, 1 January, and ends on Sunday, 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, or, likewise, 2018 and 2029 in the obsolete Julian calendar, see below for more.
Any common year that starts on a Sunday has two Friday the 13ths: those two in this common year occur in January and October.
This year has four months which begin on a weekend-day.

Applicable years

Gregorian Calendar

In the Gregorian calendar, alongside Monday, Wednesday, Friday or Saturday, the fourteen types of year repeat in a 400-year cycle. 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.
0–996172334455162737990
100–199102113119130141147158169175186197
200–299209215226237243254265271282293299
300–399305311322333339350361367378389395

Julian Calendar

In the now-obsolete Julian calendar, the fourteen types of year repeat in a 28-year cycle. A leap year has two adjoining dominical letters. 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 + 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

Roman Catholic Solemnities

Australia and New Zealand

British Isles

Canada

Denmark

Germany

United States