Acommon year starting on Saturday is any non-leap year (i.e. a year with 365 days) that begins onSaturday, 1 January, and ends on Saturday, 31 December. Itsdominical letter hence isB. The most recent year of such kind was2022, and the next one will be2033 in the Gregorian calendar[1] or, likewise,2023 and2034 in the obsoleteJulian calendar. Seebelow for more.
FromJuly of the year that precedes this year untilSeptember in this type of year is the longest period (14 months) that occurs without aTuesday the 13th.
This year has three months (January, May and October) which begin on a weekend-day.
In the (currently used) Gregorian calendar, alongsideSunday,Monday,Wednesday orFriday, 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 Saturday. The 28-year sub-cycle will break at a century year which is not divisible by 400 (e.g. it broke at the year 1900 but not at the year 2000).
In the now-obsolete Julian calendar, the fourteen types of year (seven common, seven leap) repeat in a28-year cycle (1461 weeks). A leap year has two adjoining dominical letters, (one for January and February and the other for March to December in the Church of England, as 29 February has no letter). Each of the seven two-letter sequences occurs 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 10, 16 and 27 of the cycle are common years beginning on Saturday. 2017 is year 10 of the cycle. Approximately 10.71% of all years are common years starting on Saturday.
Mother's Day falls on its earliest possible date,May 8. This is the only type of year when Presidents’ Day to Mother’s Day are only 76 days apart. They are 83 days apart in all other years
