Leap year starting on Sunday


A leap year starting on Sunday is any year with 366 days that begins on Sunday, 1 January, and ends on Monday, 31 December. Its dominical letters hence are AG. The most recent year of such kind was 2012, and the next one will be 2040 in the Gregorian calendar or, likewise 2024 and 2052 in the obsolete Julian calendar.
This is the only leap year with three occurrences of Friday the 13th: those three in this leap year occur three months apart: in January, April, and July. Common years starting on Thursday share this characteristic, in the months of February, March, and November.
Additionally, these types of years are the only ones which contain 54 different calendar weeks in areas of the world where Monday is considered the first day of the week.
This year has five months which begin on a weekend-day. This is the greatest possible number of months to begin on a weekend-day in a given year; this is the only kind of year in which this occurs.

Applicable years

Gregorian Calendar

Leap years that begin on Sunday, along with those starting on Friday, occur most frequently: 15 of the 97 total leap years in a 400-year cycle of the Gregorian calendar. Thus, their overall occurrence is 3.75%.
0–9912406896
100–199108136164192
200–299204232260288
300–399328356384

Julian Calendar

Like all leap year types, the one starting with 1 January on a Sunday occurs exactly once in a 28-year cycle in the Julian calendar, i.e., in 3.57% of years. As the Julian calendar repeats after 28 years, it will also repeat after 700 years, i.e., 25 cycles. The formula gives the year's position in the cycle + 1).
Decade1st2nd3rd4th5th6th7th8th9th10th
15th century1408143614641492
16th century152015481576
17th century1604163216601688
18th century1716174417721800
19th century182818561884
20th century1912194019681996
21st century202420522080
22nd century2108213621642192

Holidays

International

Roman Catholic Solemnities

Australia and New Zealand

British Isles

Canada

United States